How dumb is this? I just did two in 30 mins, apparently on my own as I saw nobody else and the targets were very low. I didn't fast travel between the two arcade events but drove and waited. Didn't change cars. But in the final one, I was 6 miles away from the zone I needed to get to, and only had a few mins to get there by very twisty roads so I fast travelled and that did indeed cancel the progress on the accolades. This must be a bug, not by design?!
I am wondering if I can even close the game or do any other activity other than wait for these 10 arcade events in one session. I've just done a third, completed 'double time' and the other two are on 2/5 and 2/10.
edit - done the 5 in 24h one, the other is 5/10, will try and complete it too.