While the reports are very detailed, I found (I've only done restaurants for them) that my memory for details has gotten a lot better. The first time I did an assignment, I made voice notes, now I just text myself timings and interaction quotes.
Now that I have my note system down, I think if I was working uninterrupted, I'd be able to finish my reports in about an hour. Usually I bang out the narrative, then do the checklist, then go back over the narrative and checklist. From start to finish, that'll be 1.5 to 2 hours, but that's with interruptions or me putting on the TV while I do my final check through.
They've definitely grown on me.