SEEED YF-B5 sensor Number of revolutions per Liter

I bought this sensor, and am writing the sketch to output the flow rate. But I can’t find anywhere, including the SEEED site, or the YF-B5 datasheet, what the actual number of revolutions the wheel goes through for 1 Liter. The spec’s say F=6.6Q, and that works out to 396 rpm.
But I would like confirmation from SEEED that that is the spin rate.
They show the spin rate for the YF-S201 as 450 rpm, in this article : But I don’t see anywhere where SEEED actually states what the YF-B5 spin rate is. I can figure backwards too, but it would be nice to have the Number from their Data.