[whiskas]

It's summer vacations in Brazil ( unfair advantage? remember Dean's words: it's never a fair thing - though summer does bring its own difficulties ).
Our top5 students are in @ 8 AM and go as late as someone will leave the lab open ( usually last mentor/teacher will close it up around 8-9 PM ). With lunchtime breaks, etc, it ends up between 8-10hrs/day for 40++/wk, not counting weekends ( I haven't been there on a saturday yet ).
The mentors rotate shifts, I go mon/wed/fri, another goes tue/thu/fri, a third college student will do mostly everyday after his classes, and we have the full-time physics and robotics teacher during the typical working day hours.
But no matter the number of hours - we do get behind schedule. There are things hundreds of lab hours can't do ( external jobs, waiting for parts, ad infinitum... )