Real time in days
I think that the answer you're looking for is 7 days. I'm no longer current with the regs but it's something like that. If you haven't completed the base training within that time you have to go back in the sim and do the 'base detail' again'. (That's the circuits and touch and go's that you previously did as the last - or penultimate - sim detail)
Hopefully after all the hogwash someone will come on and correct me with the correct answer.