It's been a few months since i did it, but i'm pretty sure it wasn't until i took the WP that i realized what had happened, as that's when i noticed my map wasn't revealed

That must be why it didn't work for me. WP's must trigger an auto-save. ...
The 5ish minute thing i can confirm is an auto save interval, because when i was experimenting cow runs on my javazon in Round 1, i could never tell what my time was because they were just slightly longer than whatever save process occurs and the Run Counter would always start over before the run was over. If i was paying attention to the run counter before a S/E, it would usually have previous run around 5:15-5:45 and then the next one would be 10-30 seconds, so it must not be an exact timer, but somewhere between 5 and 6 minutes.