That would be because, we use credit based on runtime, not credit new. When credit is based on run time, there is a maximum limit setting, which I believe ours is set to something like 2 days. So any task that takes more than 2 days is capped at the maximum. Both tasks you list above are way beyond this limit.

The tasks for this app were designed to take about 2 or 3 hours on a typical modern computer. There are occasional outliers, but even then the most I have ever seen is ~10 hours. Your computers are relatively fast, so I am not sure why your tasks took so long. Maybe you can answer that.