well i found thisone out by luck, on wowscape(blizzlike realm) if u bandage urself, and before the bandage is done, cancell it, it doesnot take away the bandage, so u can bandage urself an unlimited time.
Step 1: Bandage urself.
Step 2: Move before the bandage cast is done.
Step 3: Stil having the same bandage amounth.
dont know on whitch servers this works.