Damp weed?

Leaving it out it the air will dry it naturally. You dont wont to speed dry it as it will taste nasty as hell. I think you dealer is taking the piss a bit by saying 'put it on a radiator'. He shouldnt be selling damp weed. Out of that 28g you could proberly lose a 7g of weight from the water depending on how wet it is. If a dealer tryed to sell me an oz of damp bud id tell him to keep it. Dont be scared of confronting a dealer is he is selling you shit, its your money.

It isnt ok to keep it damp for that amount of time. It will go mouldy and trust me you dont want to be smoking mold.

a paper bag works very well. or, if your buds are in long stalks, you can hang them upside down. check every day for mold and flip them so the other side air's out.

If you can get your hands on some of those silica gel packets from inside pill bottles and electronics boxes, keep them and throw them in with the weed, taking them out to dry every once in a while.

stick it in the oven, on low heat, the mircowave might fry it