Ok here goes again
Summons spells(summon monster, summon animal) calls creatures from the same plane of existence if i´m not totally wrong, at least summon animal does. So those does not count as bringing outer planars, outer planars are the domain of Planar Ally spells, Planar Binding and Gate spells.
And all undead creation spells are permanent in PnP so their durations are not so wierd if they were at 24h still. Not that many casters that would use them anyway for the risk of being exposed as necromancers and grave defilers, unless of course you are those things
But the summons need a duration shift again, now they are pretty much useless unless you are high lvl and can keep them for awhile.
I vote for a change
: 24h duration for undead creation spells and maybe 1 turn/lvl for the others, maybe even 1h+ 1 turn/lvl so they are at least useable at low lvls, when they are needed.
And/or we need a bit of variety in what is summonable, by alignment or something.