Premiere Rush

The time it takes to encode something depends on the processor speed of the device that's being used.

For example, Rush can run on an iPhone 7 with an A9 Arm chip, but it's going to be much more respsive and export much more quickly on an iPhone 14 with an A15.  Or, an older Intel based computer with an i5 is going to take longer than a computer with 13th gen i7.