How long should I unplug the refrigerator so it is dry ?

Have they been out and diagnosed the fault?.
If you switch it off engineer will not be able to see it in it's fault state which could hinder repair HOWEVER some parts can't be accessed if in solid ice.I carry a hairdryer to quickly defrost areas but some engineer walk away,order parts and arrange to come back another day!
Back to your question.In a warm room and with all fridge/freezer doors open it should defrost within 24hrs

CK
November 2013

are you for real ?if its broken it not matter just unplug it now

mm
November 2013