Are the hexes of a witch 1/day or can she cast one of them over and over again.
Say the Disguise hex, can she keep it up permanently (assuming she keeps re-hexing herself before the duration is up)? Yes, I know Hat of Disguise is probably easier.
Hexes are able to be used as often as they're stated. Healing Hex for example is 1/day per person. Disguise however states the amount of time allowed per day so it is limited per day.
If there is no stated limitation on the uses of it, there's no limitation.