Export time extremely long (maybe due to mixed frame rates?)

[jonah_5542]

Hi so I'm trying to export a video i edited which uses both 1080p 60fps camera footage and iphone HDR footage (I think around 24fps). It's just under 2 minutes long but is taking 30 minutes to hour to export which is far longer than anything i typically export at this length (I have a MacBook pro 2021 with 16gb ram and M1 chip) I've tried to interperet all the footage to the same FPS because i figured that may have been creating some of the issue but that didn't seem to do anything. I'm not sure what to do in this case, I'd love to not have to render and replace each clip as the edit thus far is relatively complex but will do what it takes to avoid the export times. Let me know what you think is a viable solution. Thank you. 

[PaulMurphy]

What’s your sequence frame rate, and is your iPhone media Variable Frame Rate (VFR)?

If you’re working with VFR media, you might find this guide helpful: How to Work with Variable Frame Rate (VFR) Media in Premiere Pro.