How long is confinement ? Is it 28, 30 or 31 days?Is it on day 31 we can start blow fan or need wait

How long is confinement ? Is it 28, 30 or 31 days?Is it on day 31 we can start blow fan go out or need wait? Does it count from the day we give birth in hospital ? Aka my give birth date is 6 Apr, baby full month is 6 May. Does full month mean I'm free to blow fan and go and wash hair everyday from 6 may onwards?