I've been using a computer for quite some time, and I don't understand everything.

I have been a member of the Microsoft-bashing society for quite some time.

UF is Utilization Flight. That got put in the manifest quite some time ago.

The Eagles ended on a rather abrupt note, although in retrospect I realize now that it had been ending for quite some time.

Every time I learn a new thing to do on my computer, I have to write it down so that I can remember it.

I've used my time at 'GH' to learn some discipline.