Freshers is typically one or two weeks. It is the same thing as welcome week (this term is typically preferred as they want all students to feel at home and “freshers” often has connotations to binge drinking).
It has a few aims:
- mainly administrative: get you registered, setup IT stuff, learn course structure, meet & learn key people (such as your course director, tutor).
- personal admin/housekeeping: ensure housing & financial stuff is organized (often more of an issue for international students, who need to setup UK banking etc.)
- familiarization: learn the university, the local area, shops, routine...
- have fun & make friends