Heightened Invocation: Rituals, Curses, Curse-Breaking

I like the Heightened Invocation feat as a way to deal with magic rituals, curses, breaking curses, all of the ideas of magical rituals.
The effects make sense for these scenarios but with the requirements for permanency being Extraordinary Attribute 9 and Feat Level 3, it seems that these things are only available to very powerful characters.
I’d like to discuss having a longer effect duration as an option at Tier 1 or 2.
Under current rules, if you Polymorph someone, it lasts 1 hour. The range can be extended at Tier 1; I think that the duration should be able to be affected as well. It might last 8 hours, 1 day, 2 days, etc.