| For a standard clutch the minimum I would expect would be to go with Dibbles answer, for some reason he knows what he's talking about here.
If its a slipper cost of parts could be higher.
Worse case may be some damage to the outer casing and the clutch basket getting knocked out of true, then again it could try and push the whole gear shaft through the otherside of the engine. | 
skidlids
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