Usually one week after the RV rental trip ends.
RVShare gives 3 days for the owner to inspect, claim any excess charges and/or damages, if no claim is made within 3 days then the security deposit is released to the renter that may take another 1-2 days depending on the renter’s bank.
Outdoorsy gives 7 days for the RV owner to claim any excess charges or damages. The funds are released thereafter that may take another 1-2 days.
CruiseAmerica – Any excess charges or damages are claimed immediately at the time of return. It is likely that you may get your refund 2-3 days after you return the RV.
Local RV Dealers – Their process and timelines are very similar to CruiseAmerica.