I just got it for 10 posts in half an hour.
Per https://www.quora.com/Who-has-th… , looks like it blocks for 2–3 days. Was blocked for4.5 days now; appealed through bug report (and thanks to Tatiana Estévez for investigating).
In my instance, the block applied to all posts I owned, and was deemed a bug. If you get this, a bug report is the way to go; but stop short anyway of 10 posts per… I dunno, hour? day?