Er... These guys are still practicing 50 hours per week. FIFTY. That's _a_lot_ of violin.

So assuming you take one day off per week, you still need to pack 8 hours and 20 minutes of practice per day. So, we stack these hours in 2 sessions of 4 hours and 10 minutes per day. One in the morning and one in the afternoon. So what does it look like? They work from 8am to 12.10am, then take a break until 2pm, then work from 2pm to 6.10pm and then be done with the day?

Sounds like a typical workday for a lot of people...