When you're a business that's a long time to go without e-mail.
A prolonged, ongoing Gmail outage has some Google Apps administrators pulling their hair out as their end users, including high-ranking executives, complain loudly while they wait for service to be restored.
At around 5 p.m. EST on Wednesday, Google Inc. announced in the official Google Apps discussion forum that the company was aware of a problem preventing Gmail users from logging into their accounts and that it expected a solution by 9 p.m. on Thursday.
...When the applications become slow or altogether unavailable because of problems in the vendors' data centers, IT administrators have little to do but sit and wait for the problem to be fixed. This often creates extremely stressful and tense situations for them if the outages are prolonged and their end users become angry.
Extended Gmail outage hits Apps admins (Computerworld)