Cash out refinance in less than 6 months ?

Currently in the process of purchasing a property that i plan on using the BRRR method. However the private and hard money lenders that I am in contact with say that the earliest they can refinance is 6 months. Is this normal considering the climate or is it lender based. Considering my efforts to move on to the next mult as quick as possible I would like to refi once tenants are in there.