This is not necessarily a server-related question, but more of a system admin question that I think would related to many on SF.

I'm doing Sysadmin/IT consulting for a small company. I only work about 3 days a week for them on average.

If a server goes down or something like that during off hours (nights, weekends, 3am, etc) and they need it fixed during those time periods, should I be charging overtime for that? I would I not be justified in charging overtime until I've logged 40 hours for the week?

Perhaps calling it overtime isn't the best name. I guess maybe its better to call it an off-peak hourly rate. Anyways I just was curious what other consultants did in these circumstances.