obsurdly long print time for a rather small print

[Barzar]

Good Evening,
I have a big problem with printing this panel.
It should be just an hour print but cura either doesn't slice it at all or give me a print time of 2 hours.
When I print it anyways the printhead will just wander off to one corner and gets stopped because it reaches the boarder of the Buildplate.

I have no idea what could trigger this weird glitch. It's just a simple Plate with a few cutouts for some switches.

Things I already tried:

- remodeling a couple of times
- try to repair the stl file with an online tool
- moving / rotating it around in cura

I really hope you can help and I apologize for my bad English
Thank you and have a nice day


-Update_
I cut the piece in half and the 5 putton layout on the left prints no problem but the squared buttons still don't want be printed.