Game Mechanics: Hide wearing off after a few minutes?

[Kvappe]

Iwe had monsters see me sometimes even tho both hide/sneak was succesfull, 50 rogue with max skill 200hide 200sneak, should rarely be seen, i do think how ever that one of the times was in SolB a bat saw me, that was after i went though the trap right before Bnb. no dammage was taken, but was still in hide sneak mode, had see invis up at the time, the bad conned Indiff. but after sneaking by they still attacked.

Shadze