Okay i just installed Supreme Magicka and Lame and my question is...

Is it normal for my summon skeleton to have 25000 duration?

What spell is it?

Generally, no, it's not. At least from the spells I've seen from the two. I could imagine that there's a super long skeleton spell in one of them, but I doubt it.

If sustainable summons are turned on then that is normal. If you don't like it, turn off sustainable summons in the ini.

Hello, thanks for answering. I will try and disable sustainable summon and see.

How about when i summon a skeleton i see a huge shadow then it vanishes. Looks like a visual problem.

I think that shadow is part of the summon effect. It does nothing.

It's above the summons head, right? Maybe not on top of the head, but above it.
If so, that's part of the standard SM undead summon effect. Not a visual problem.