Scroll through any TEFL course catalog and you’ll see numbers everywhere: 60 hours, 100 hours, 120 hours, 150 hours, 250 hours. It’s tempting to assume more hours simply means “more legit,” but that’s not quite how it works. Course length mostly reflects how much pedagogy, grammar theory, and practical teaching skill is covered – not just a bigger badge to put on your CV. Here’s a plain-language guide to what each hour range actually gives you, so you can pick a course that matches where you actually want to teach.
Why TEFL course length varies so much
A TEFL/TESOL course is, at its core, a training programme in how to teach English as a foreign language: lesson planning, classroom management, grammar and language awareness, teaching different skills (speaking, listening, reading, writing), and increasingly, how to teach in an online, one-to-one, or virtual classroom setting. A shorter course covers the essentials of one or two of those areas well. A longer course works through all of them in depth and adds more practice activities.
So the useful way to think about hours is: how much ground does the course cover, and how deeply? Not: which number looks most impressive on a certificate.
What a 60-100 hour course is actually good for
Shorter courses aren’t “lesser” TEFL certificates – they’re built for specific, narrower jobs. A course like How to Teach English Online (20 hours) or the 20 hour Essential English Grammar course exists to build one particular skill fast: running effective online lessons, or shoring up your own grammar knowledge before you step into a classroom. The 80 hour TESOL Re-equip course follows the same logic – it’s aimed at people who already have some teaching background or an existing qualification and want a focused refresher rather than a full course from scratch.
These shorter routes tend to work well if you already teach on online tutoring platforms that only require a basic certificate, want to add a recognized certificate on top of an existing degree or teaching qualification, or are filling a specific gap alongside a longer course you’ve already done. Where they tend to fall short is with employers and, in some cases, embassies or visa-issuing authorities in countries with more formal TEFL requirements – many explicitly ask for 100+ or 120 hours as a minimum.
Why 120 hours became the de facto global minimum
If you’ve researched TEFL requirements for more than five minutes, you’ve probably seen “120 hours” repeated everywhere. It’s become the industry’s practical baseline for a reason: it’s roughly the amount of training needed to properly cover the core skills – grammar and language awareness, lesson planning, classroom management basics, teaching all four language skills, and an introduction to different learner types – without cutting corners.
Many language schools, recruitment agencies, and government teaching programmes (particularly in East Asia, the Middle East, and parts of Europe) list 120 hours as their minimum accepted certificate length, and some countries’ work visa or embassy requirements are built around that figure too. That’s why the Level 3 – 120 Hour TEFL/TESOL Course is usually the sensible entry point if your goal is to move abroad and teach in a language school or classroom setting: it’s recognized widely enough that certificate length alone is unlikely to be the reason you’re turned away.
What the extra depth in a 150 or 250 hour course adds
Once you go beyond 120 hours, the additional time isn’t padding – it typically goes toward things a shorter course simply doesn’t have room for:
- Deeper grammar and linguistics theory, so you understand not just what’s correct but why, and can answer the “why” questions learners ask.
- More thorough classroom management strategies for different group sizes, ages, and behavior patterns.
- Specialization content – teaching young learners or Business English in more depth, rather than a brief introductory section.
- In the case of Level 5, 250 hours of tutor-marked study.
The Level 4 150 Hour Advanced TEFL/TESOL Online Course sits in this bracket – a solid step up for people who want more thorough training than the 120 hour standard, whether because they’re aiming at competitive job markets or simply want extra confidence going in. The Level 5 250 Hour TEFL/TESOL Professional Course is our most in-depth option: it is accredited by ACTDEC at Level 5 and covers 52 modules, two essays and four lesson plans. It is not Ofqual-regulated. Assessed teaching practice is available as a separate add-on course.
If you already hold a certificate and want to build on it, the 30 hour Teaching English to Young Learners (TEYL) Specialist Course and the 30 Hour Teaching Business English Specialist Course are designed as add-ons, not starting points – for specializing once your core certificate is already in place.
Matching the course to your actual goal
Rather than asking “which course is best,” it’s more useful to ask “what am I actually planning to do.” A few common starting points:
- Teaching online only, casually or part-time: a short, focused online-teaching course may be enough, especially if your platform doesn’t set a higher requirement.
- Moving abroad to teach in a language school: plan on 120 hours as your working minimum – the figure most widely recognized by schools and immigration requirements.
- Teaching young learners specifically: get your core certificate first (120 hours or above), then add the TEYL specialist course.
- Teaching Business English or corporate clients: same logic – core certificate first, then the Business English add-on.
- Wanting our most in-depth option: the 250 hour ACTDEC Level 5 course. Assessed teaching practice is available as a separate add-on course.
- Already teaching, wanting a refresher: the 80 hour Re-equip course is built for this.
What no certificate length can promise
It’s worth being straightforward about this: no TEFL course, at any hour count, guarantees you a job. Hiring depends on the employer, the country, your existing qualifications and experience, and often on factors outside anyone’s control, like visa eligibility or which passport you hold. Course length affects which doors are realistically open to you – a 250-hour certificate will satisfy more employers than a 20-hour course will – but “satisfies more employers” is not the same as “guarantees a job.”
Requirements also vary by destination. Some countries have specific minimum-hour rules written into visa requirements; others leave it up to individual schools. Before you commit to a course length, spend twenty minutes checking the specific requirements of the country – or the type of teaching, online, in-person, young learners, adults – you actually have in mind, rather than assuming one hour count works everywhere.
Choosing your course
If you’re still unsure, 120 hours is the safest general-purpose choice for most people planning to teach abroad, with 150 or 250 hours worth the extra investment if you want deeper training or plan to go for more competitive roles. Shorter courses and specialist add-ons make more sense once you know exactly what you’re using the certificate for. You can compare the full range of course lengths, prices, and what’s covered in each on our courses page.