After thinking about it, I feel like my price was way to high as well as instead of using interval I could of used increments, any advice appreciated.
Gloves of Spell Grip
Aura strong evocation CL 15th
Slot hands; Price 65,000 gp; Weight 1 lb.
These leather gloves have an image of a crumpled spellbook on their palms. The gloves control spells cast by the wearer that have any duration other than instantaneous or permanent twice a day. The activation time for the gloves is the same as the spell they wish to hold, with a minimum of 1 standard action. Only one spell can be held by the gloves at a time.
This control acts like holding a charge, the spell's duration can be released in the same intervals listed in the spell's description. For example invisibility has a duration of 1 min./level; a 5th level wizard casting it and holding the charge with the gloves can become invisible for five 1 minute intervals divided as he/she chooses until the spell's full duration is used up or lost.
The wearer can cast spells normally while holding a charge with these gloves if they succeed at a concentration check with a DC equal to the spells DC + spell level; failure harmlessly discharges the held spell regardless of the remaining duration. The wearer cannot cast a spell and release an interval of charge on the same round.
If the spell being held by the gloves allows multiple touch targets, you can't hold the charge of such a spell; you must touch all targets of the spell in the same round that you finish casting the spell. During the wearers turn the held spell can be released as a standard action; acting as it were cast normally with its remaining duration.
Requirements Craft Wondrous Item, imbue with spell ability; Cost 32,500 gp