Gregory's Server
~30 years ago, I recall Adobe Premiere going backwards;
15 secs out of 3 minutes
30 secs out of 8 minutes
1 min out of 15 minutes
2 mins out of 30 minutes
4 mins out of 60 minutes.
8 mins out of 80 minutes.
16 mins out of 90 minutes
It became a sport to see who could guess the total time the closest within the first minute or so.