It used to be 60 days and I think it still is in the US. Might be 90 days in the UK, not certain.
That is the gaping hole on eBay for timeshare transactions. You should allow for at least 90 days for some Timeshare transactions. By the time you pass that it is too late to leave feedback.
It’s sad that a home purchase would never in a million years take 90 days but that is the normal max for timeshares if nothing goes wrong. It’s laziness, or the lack of urgency, by all parties. Home purchases are the opposite on the urgency scale.