Mark's department has managed their workload efficiently enough that today and tomorrow, they'll only need to work 10-hour days. Next week, they are tentatively slated to return to having 8-hour workdays. This is subject to change at any time, just as the "not working Saturdays" directive could be revoked at any time.
I suspect that as long as other departments are withstanding the work stoppage as well, the extra hours won't be needed. But if any other departments start to fall behind, the people who aren't needed for extra hours will be recruited to help bring everyone back up to speed.