Every device provider is different. In general the lifecycle of data from your wrist or pocket tracker is the following:

1. Device
2. Smartphone
3. Provider servers (Fitbit etc...)
4. KrowdFit Data notification
5. KrowdFit servers
6. KrowdFit app

That data round trip can take up to 12 hours, in some cases it is much quicker. Additionally, KrowdFit performs a manual sync each night to make sure we didn't miss anything throughout the day.