I used it yesterday afternoon-night and this morning-afternoon, UK time, over a period of a few 5-hour windows. I didn't count the prompts, wall time was 1d6h, API time was 2h10m.
Strange though... I spent my window after a couple of prompts and effective API time of 13m. Out for 4 hours and a half (why that?). The next day, today, I've tried to repeat the experience - even worse: one prompt for less than 10mins... and then suspended for 8 hours and a half. WTF?