How long does a PhD really take?
There’s no honest answer to this question without knowing your topic. What we can provide: the factors that make the difference, a phased plan with verifiable milestones, and a clear explanation of which part of the time is entirely out of your control.
If you’re studying alongside work, a PhD generally takes several years. The range is determined by four factors: your subject area, access to data, prior work that counts towards your degree, and the number of hours you can reliably commit each week. A significant portion of the time is also in the hands of the faculty, namely the acceptance of your proposal, the peer review process and the date of your public defence.
The four factors
Three of these are largely fixed from the outset; one is the key factor: the time you actually devote to your studies.
Empirical work involving your own data collection takes longer than conceptual work. In law, the volume of material is the deciding factor; in engineering, it is access to experimental set-ups or datasets.
Those who can access existing datasets save months. Those who first have to negotiate access should plan this as a separate phase.
Publications, preparatory work or an extended Master’s thesis may be recognised. Whether and to what extent this is the case is decided by the faculty, not by your own judgement.
The biggest factor. Between 5 and 15 reliable hours per week make the difference between six years and three.
The phases and what they cost
A phased plan is more helpful than a total figure, because after just a few months you can see whether your plan is working. Each phase should end with a result that you can present.
The part that is not in your hands
Depending on the faculty and the availability of examiners, several months often pass between submission and the defence. Obtaining two reports takes time; committees meet according to their schedule; and there are deadlines for displaying the thesis. This time cannot be shortened, but it can be factored into your planning.
There are also waiting periods beforehand that are beyond your control: feedback from your supervisor, ethics committee approvals, and clearances from companies. If you are aware of these factors, you can build in sufficient time for them.
Why ‘finishing in two years’ almost always fails
Completing a thesis in two years whilst working full-time assumes that every stage runs smoothly: immediate confirmation of supervision, available data, no endless rounds of revisions to the synopsis, and a swift review process. In practice, all these factors rarely align.
Anyone who nevertheless advertises a guaranteed short completion time cannot keep to it, because the university decides on acceptance, assessment and the date of the public defence. A promise regarding this is a promise based on decisions made by others.
How to make your own estimate
Take the hours you’ve actually had free over the last three months, not the ones you plan to have. Allow for four to six weeks a year for absences. Work through the stages with their respective outcomes and build in a buffer for any stage that depends on third parties.
The result is usually uncomfortable, but that’s the point. A plan that survives the first six months is worth more than one that looks good.
Frequently asked questions.
Is it possible to complete a PhD in two years?+
In exceptional cases, and usually only if a significant amount of preparatory work has already been done and the data is already available. For those studying whilst working, this is the exception, not the rule.
What is the main factor determining the duration?+
It depends on the amount of time you can reliably commit each week and on your access to your data. Both of these can be clarified in advance.
Are there deadlines by which I must complete my PhD?+
Many doctoral regulations set standard deadlines and provide for the possibility of extensions. The regulations of your faculty are decisive.
How long does the process take after submission?+
Depending on the faculty, it often takes several months from submission to the defence. This timeframe is beyond your control and should be factored into your plan.
When does the deadline start?+
As a rule, it starts from the date of your acceptance as a doctoral candidate, not from when you first conceived the topic.
Does having a supervisor speed up the PhD process?+
It does not shorten the process, but it prevents delays: unsuitable supervision requests, an exposé being sent back, or a timetable falling apart in the first term.
What should I do if I fall behind schedule?+
Decide early on and inform your supervisor: reduce the scope, extend the timeframe or reallocate resources. Concealing a delay is the most common route to dropping out.
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