With a poly coating on there it’s more difficult to say.

Personally I keep an eye on the colour of the wood. When it starts to look dry and pale, it’s time.

The wood will let you know, it will stop soaking the oil and wax and you then wipe off the excess and start buffing.

It may let oil seep out for a few days after, as it adjusts. Just wipe that away. Food grade mineral oil (which I use for all my boards) is non toxic, but it is a laxative, so do wipe up and excess before using the board 😁