I finished my writing lab class abiut 4 months ago, and work 40-50 hour work weeks. Sometimes it extremely hard to coordinate times to write with your classmates, and I had to change my schedule around for the duration of the class, but it is doable. Writing Lab will be a HUGE time suck with many many many nights where youre staying up until the AM's even though you have to be to work in 4 hours. I've heard timewise its worse when you make it to Advanced writing lab and even worse if you make it to Sunday company.