Suggestion for hammer cleanup

[elekktretterr at exemail.com.au]

I think we definitely must have hammer cleanup not depending on periodic.
Especially laptop/workstation users, since they may be running only couple
of hours a day.

The system should be able to automatically initiate hammer cleanup
whenever it's been more than 1 day/x hours since last time it was run. It
doesn't matter if its day or night.

Suggestions?

Petr