an hour a week is usually enough. But, if you are anything like me, I clump it altogether and empty my purse of receipts monthly and put them in an envelope for future reference.
I do my outgoings twice a year and it takes me a few hours each session.
I check my diary and make updates to it daily which takes 10 minutes.
I also keep a record of treatments and fill that in every few days, again it takes 10 mins.