FB group just posted (well, UNOFFICIAL) tables with wait times for nodes... If those are true, "Frozen Lake" race will have 41h (sic!) wait times per lap on laps 10+: 8h, 9h, 8h, 8h, 8h.
The tables do look a bit suspicious, with laps 7-9 (apparently) mixed (unless, of course, wait times are going to be longer on lap 7). But even if sorted, it would be 2.5h for lap 7 (and that is not counting the wait times for fights - with that it's more likely something like 6 hours even if you buy out the last fight), 20h for lap 8 and 29h for lap 9. Which amounts to 257-260 hours for the race to lap 15, assuming you immediately collect everything you needand don't spend half an hour trying to get a stupid breeding trophy. 11 days is 264 hours, so this leaves about 4 hours to complete laps 1-6 (which, again, contain a lot of fights).
In other words, expect the gem cost of the high snow to be sky-high.
EDIT: Live link removed per forum rules.