Long days mostly, and the communication lag with HQ. It's possible to get sucked down a rabbit hole for days on end, sinking in far too many hours. However, in the end, it's a personal choice to do hours and hours of work beyond what you're salaried for. The 8 hour lag with California is also a pain in the rear - you either live with 24 hour turnaround on question/answer threads, or you stay late to try and catch someone in real time.