Last week I encountered something strange here on the servers.
Retracting a solution file (*.wsp) took just a little longer than 1 hour! Which is WAY longer than it should take, and usually takes...
My theory: daylight savings time messed up something in the configurations ... Here in Belgium, 2 AM became 3 AM (03/30), which apparently led sharepoint to think that when I scheduled a solution to retract immediately, we wanted to wait an hour to do so ...
Update: apparently there is a hotfix from MS addressing the problem at http://blogs.msdn.com/sharepoint/archive/2007/10/09/important-security-hotfix-ms07-059.aspx - Thank you Tobias!