Like the other posters have said, the amount of lab time you get will vary depending on the particular university you attend, the particular engineering discipline you are on and probably also depend on the specific optional modules you pick.
As an example, in my case I had 1 or 2 sessions of EE lab sessions and 1 computer lab session per week in the first year. In the second year, we had 1-2 EE sessions per week but some of the lab sessions doubled in length to 6 hours (we had no computer lab sessions for the second year software development module). In addition to the timetabled lab time, at times when we were doing EE projects as part of a compulsory design course then we had access to the EE labs pretty anytime they were not in use, so many people spent many hours a week in there. In the third year, all the compulsory EE modules had no timetabled lab sessions so if you were doing labs it would be due to you picking an optional module (or modules) which had practicals. In the third year there was a third year EE project lab were you could go and do your individual project work. In these labs you have no permanently allocated lab space, so you need to pack all your electronics in a box every time you left the lab so the next person who comes in could use the same lab space. These labs were available almost all the time as very few timetabled lab sessions take place in there. In the fourth year timetabled lab sessions also depended on what optional modules you picked. For the fourth year group project there was a masters EE lab, In this lab your group would have dedicated lab space which you could use anytime you wanted so you did not have to pack your setup when you left the lab.