I live in Melbourne.
We have one of those timer clocks on the shower wall - cept its flat batteries right now...

I have tried but 4 minutes is not enough for washing my hair and shaving and everything else. I have started having a bath once a week to do a really good soak, scrub and shave. Other days I shower and only tend to wash my hair twice a week - though it really needs to be three times. My legs just stay hairier than Id like.