Yep turns out it can be used on someone else, which actually isn't to bad a deal. I'm still thinking we need a JA / JT that gives us quick-magic, that's just classic RDM "Double Cast", but knowing how every other FF game is we'll be getting it at 99. I see this useful to used on BLM's trying to proc something, their spells have ridiculous cast / recast times, or for quickly raising two people back to back. Could also be used as an emergency "shields up" macro to get stoneskin up RFN. There are lots of use's to it, but 10mins definitely too long. Make it 5 min and we're set.

If you feel 10min is too long, make a post and explain it out, work as a community and SE might take notice and change it.