system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How does Doctor Strange use the time stone in the dark dimension if it is a place without any concept of time?
gpt
No concept of time, not no time at all.

Dormammu is an extradimensional being in a plane very unlike our own.  For all we know, nothing changes in the dark dimension; what is is what was, and what was is what always will be.  He’s clearly familiar with the concept of mortality, but for someone that has spent eons in his home dimension, death is something for those lesser creatures.  Something they bring from their dimension.