Has anybody ever visited all frostland sites in Endurance Mode between two storms? I've tried dozens of times, but always have one or two left. In Serenity Mode it's no problem at all.

Yes i've done it.. nothing special happens besides an achivment..

It's usually not possible in endurance. Serenity gives nice long gaps between the storms, but in endurance the next storm is only a couple days away when the previous one lifts. It's just the reality of endurance mode; you're not meant to be able to visit everything before you need to scurry home.

Thank you.
The period between 2 storms seems to depend on mode only: serenity 14-1 vs. endurance 8-2 days. I just wanted to be sure it's not possible in endurance, because often it's so tight. Just a "personal achievement" I'd like to earn...

Sorry, correction: in serenity easy now I have 11-2 days. So the timing seems to depend on difficulty, too.