F.A.O any decent boiler fitter, after my ravenheat packed in on saturday i got a corgi plumber, he said by the time i payed for all the parts it would be as cheap to buy a new boiler,so of i went,£575 later they started the job which was taking 3 year old ravenheat off and fitting new ideal isa24 he on to exsiting pipe work flu hole is already there my question is how long should this take?(2 men)