Extended reduce person effect for Eidolon?

[Hock]

So in PFS, it is often impractical to haul a large creature around. Hence, it is often best to leave one's Eidolon medium. However, the Large Evo is one of the best bang for your buck ones you can get, so skipping it is limiting.

One can use Reduce Person to drop it back to medium, but it is very limited duration. Is there any way to extend this or have an item of it, PFS legal?

[Master of the Dark Triad]

Meta magic rod of extend spell? That's still only minutes per level, though.

Remember, you CAN unsummon it. You still have spells and SLA summons if an unexpected combat comes your way, so don't be afraid to put your eidolon away in situations where a giant monster's presence isn't... Appropriate.

[Zedorland]

Maybe try the summon Eidelon spell instead. same duration, but it has to last for the duration of the combat, rather than the time between.

Also if you have augmented summons, your eidelon will receive the bonuses for the duration of the spell, which is a bonus.

[Hock]

Actually, I just realized my plan doesn't work - I was going to use the Large evolution, then shrink it to Medium for day to day use, with the option to dismiss the spell and use Greater Evolution Surge to bump it up to Huge on the fly. However, the Evolution Surge line does not permit stacking - you can't upgrade an effect you already have. Hence, there is no way to gain Huge through Evolution Surge - you have to take the base Evos, which is *really* impractical in PFS. So I guess I'm just as well off leaving it Medium and using the middle Evolution Surge to make it Large on the fly.