Leaving mh standing how long

PaulandKate

Hi first question on ct 

we've parked our mh in storage it could be stood for 3 weeks due to commitments made prior to buying beryl (the motorhome) we can go and fetch her and give her a run out for an hour next weekend that would be two weeks standing 

what duration of time can it be left stood until she starts suffering 

new to all this so any advice would be greatly recieved