I'm sorry about the loss of your kitty. Thank you for giving him such a good life.
The conventional wisdom is to wait 30 days to be 100% safe.
However, the risk is virtually zero after just 48 hours. The virus dies quickly outside the body and is susceptible to pretty much all routine disinfectants.
I would replace all soft things used extensively by your old cat (e.g. beds, catnip toys), or wash them and put them in a bag in a closet for a month before bringing them out again. Dishes and litterboxes should be replaced or thoroughly disinfected. If you do these things, I think you will be more than safe if you wait a week.