[WalterBright]

> A shower, I don't need to track it to know I can do it between 2-15 minutes. Or less, if I REALLY need to get going.

I just put a big (so I can read it without my glasses) battery operated (no electric shock risk) cheap (cuz I'm cheap) clock visible from the shower.

[medstrom]

Counting in my head works too. When I aim to finish after 120 seconds (2 minutes) I'll wind up taking 300 seconds (5 minutes), but that's better than taking three times that long.