its more a preference thna a necessity, people like ot do wolkr for their topic straight away thna leaveit, othe like to have soem time to do mroe study before tutes etc. Same with lecturers/tutors, due to the numbers, they have to have more tutes runnig ot fit, but it depends on personal preference, som electurers some may feel are not as good and like other tutors and vice v ersa.
4 days is normal for some, other swho are lucky can do it in 2 or 3 days, but usually they may attend a night lecture etc. lectures though not really compulsory, usually lecturers dont mind if you turn upo to any of their lectures as long as you learn; but tutorials are compulsory so you have to go. just speak to them and usually you can go to lectures unless they are full.
i had five days in my firs tsemester, it depnds on your timetable and subjects selected...