Apple Watch on wifi - synchronization of Fitness data?

[Canyda]

Question:

If I go to an out of country resort, get my Watch on the wifi, turn my phone entirely off for days, and do fitness workouts… will the Watch still synchronize the data through iCloud via the wifi so that I get credit towards challenges? Or does that only happen if my phone is on?

And how many days data can a Watch store unsyncronized before it gets deleted?

 

[bricktop_at]

AFAIK the watch can go 7 days autonomously and will only sync to the iPhone, not directly to the cloud