adbosch, I corrected the info - one min of slide show is equal to 10 pages turn. Those numbers were about PB301+ where I do see slide show option while on PB302 with 15.2 I also can't find it
Will need to check.
Another interesting point I read there is that file format also matters. 16000 is for natural fbreader format fb2, while formats like pdf take much more energy.