It's pretty intense to be fair - but so is any pharmacy course. Its quite hard to put a figure or value on it, mainly because a few things have changed since I graduted and I haven't experienced it myself.
1st yr: Generally 9-5 Monday-Friday (an odd few hours off here and there)
2nd yr: 9-5 semester one. Then a bit quieter in semester 2. Still a lot to do but sometimes get a whole afternoon or morning off.
3rd year: 9-5 with a few mornings or afternoons off - fairly stable over the course of both semesters.
4th year: Semester 1 is fairly quiet; in for a few hours each day. First 5 weeks of semester 2 is MPharm projects so you'll be working 9-5 if not more on that. Then it dies down again. Whilst the contact time during the 4th year is a lot less you actually have more work to do that in the other years. There aren't as many assessments but there is a lot more self directed reading to be doing. In essence, it is very much treated as a Masters year.