Basically, my character concept is a wise but aged man in hit late 70’s, so not necessarily melee combat built. Through backstory, he’s bestowed with the power to summon this Eidolon to his aid. The only thing is, it’s a 1 minute ritual to summon. Which means, whenever we jump in to combat, it would take me 10 rounds to get my Eidolon out, during which time my feeble old fella is likely to bite the dust. Summoning beforehand is circumstantial and doesn’t work if we’re surprised. Without the Eidolon, my character is pretty useless combat-wise, so I was talking to my DM about allowing the summon as a standard action. I know some have also said about summoning at the start of the day and just keeping it out, but I also don’t want to walk around town or talk to NPC’s, meet with royals, barter with merchants, cook, sail, etc while enshrouded in a monstrous murder machine. I was thinking more of a symbiotic/The Guyver type situation. I also said that outside of my dismissing the Eidolon, if it’s dismissed for any other reason - death, banishment, other magic, etc. - that I would need to use the ritual to resummon it back the first time. So basically I summon it back, then it just goes in to hiding when not in use. If there’s a penalty or balance you suggest for this too, I’m all ears. And I know disguise self and all that, but I’m starting at level 1 and I don’t wanna burn a spell slot just to walk down the street every single time haha. Lemme know what you all think. I don’t think it should be too game breaking right? I basically wanna use it like summoned armor. If you have a better way or doing this as well, please share. Maybe a feat or something I missed. Thanks!

tl;dr: I don’t want to need 10 rounds every time we get in combat to summon my Eidolon, but I also don’t want to walk around with the summoner form out when I’m just being casual. Asking my DM if it can be a standard action just to summon my Eidolon as a Synthesist. Will that be ok?

EDIT: Thanks everyone for your input. You’re all right and I’m going to just leave it as is and work around it. For the few instances where I’m unable to summon, I’ll just have to deal with that as it comes as a balance to the times where I am a wrecking ball on the battlefield. Thanks again!