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Is there a way to increase the duration summons last preferably to hours/days+ I want to use them for protection purposes e.g. summoned creature guards this object/person/place while the mage is busy elsewhere. All I can find is extend to increase the duration from 2 to 4 minutes which while fine for normal combat is not suited to what I want. I'm just wondering if there's any options I'm missing that aren't archetype's or specific classes which would allow a general caster to have a creature around for a prolonged period of time preferably years or centuries but I'll take what I can get. I could just handwave it as this is the idea for a series of key's to an ancient big bads prison guarded by powerful summoned beasts long after anyone who fought against them have forgotten them. So NPC but I don't like having different rules for NPC's and players.
summon guardian spirit - make the summon 1 minute per level instead of 1 round per level, and summon a very specific creature from a limited list.
if we do regard classes then.
a summoner who doesn't need to sleep (like wyrwood) can have his eidolon present for years on end.
an antipaladin of 5th level+ can have get an option for a companion that has permanent duration.
well for longer duration you usually need to call an outsider - with ether planner ally or binding. that can last days or even more depend on how it works.
or use the alt option of cloning\possession.
-possession can also be the outsider possessing a victim\item\place on the caster's place. with the different possession feats(creature\location\object)
well not feat related. some level 20 spell caster spec in summoning get a permanent summoned monster, but you asked for non class ability.
summoning usually make an artificial body for the host to use. is why no1 really die when one is 'killed' id say that use a lot of power which is why regular summoning is round\level.
if you call the being over that can last a lot longer. but then you have to deal with a being that need some kind of convincing to work for you (binding\ally).
the point is there is a power balance that is need to be checked. if you summon you get short duration, but can order around with little care. if you call an ally you need to pay for the service in gold. if you bind you risk the whole 'unchecked fiend running about' if you fail to keep it under.
trying to get a summon to last longer is shifting the balance and there should be very few and strict ways to allow such a thing.
For a permenant slave/minion/partner you would be calling the actual being into your service, not just its shadow clone [or whatever appears via summoning]. So we are talking Magic Circles, Dimensional Anchors, and Planar Binding... and at least 500gp [the Sinner's Wage] as an offering. You can get yourself into this mess using scrolls pretty early in the game, too, but it behooves one to not try bind creature with a higher CR than one's own HD.
Or, use the Undead...
For that type of task you don’t use monster summoning you use the planar binding or planar ally spells. Divine casters have a big advantage on this since they don’t need to worry about the opposed CHA roll.
There is a 3rd party book (can't remember name) that has feats that had a system of High Magic(?) feats and one of the feats allowed extend spell to be what you want. I might look for it later.
Alter Summoned Monster may work, but that's the kind of cheese most GMs will look down on. Also, there's nothing really compelling monsters summoned in that way to obey you as anything other than a mount.
Outside of the aforementioned options necromancy id always a go to for the gm in need.
Of course if we're talking encounters for a gm good ole fashioned handwavium can be hammered into it to just get the desired result. It doesn't matter how the hellhounds came to guard the door only that they're there. Whether by spell, item, or excellent diplomacy enhanced with superb catering it ultimately won't matter to the pc's who are murdering it.