as long as you want to study.
It's a lifelong study.
How long are acting colleges?
they don't need to study at college
One which sets out to study a group of subjects over a long period.
you must study to be a farmer for about 2 to 3 years
As long as it takes to answer their questions.
it takes four years
7 years
8 years
It depends what you study there.
Until your funding runs out. Or you die, I suppose, but you could always get students to carry on the study after you're gone.There's no real time limit (other than the natural ones such as how long you stay interested, how long you can afford financially to do it, and how long you live) to how long a study can go on.