6497/6498 movements are designed for about 45-50 hours of reserve (I've heard of some reaching 52!) so, as above, something is not right.
Basically you can wind it till it will wind no more - I believe the mainsprings are incredibly strong and difficult to break so do not worry about over-winding it, I don't think it's possible unless you are a completely heavy-handed oaf!
Don't be scared, the 6497/6498 movements are pretty much bulletproof
