iPhone 15 Pro 4K/60 ProRes Log Export Takes a Long time

I shot a choir song with the iPhone 15 Pro at 4K/60 in Apple ProRes Log. The 3 min 53 sec file was 37.5 GB. (Made me smile.) The export in Premiere Pro using settings for high quality took around 5.5 hours (approximate because I let it run at night). But, wow, the quality of the exported 1.3 GB file was wonderful. I'm kind of wondering if the export time is unusually long for ProRes Log, or if it's about what's expected. I used Freelab for the Rec.709 conversion, but I don't see how that would increase the export time. Anyway, an interesting experiment, and the quality is amazing. Tech: i5 12600, RTX 3060, 32GB RAM, fast Samsung SSDs.