CONTACTS - SYNCRONYZING, how often?

1. How often is syncronized with my cellular the showed list of contacts ?
2. And how push manually the sync?

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[*]How often is syncronized with my cellular the showed list of contacts ?
[*]And how push manually the sync?
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Hi, AirDroid syncs the contacts everytime you log in and connect to the phone. when you are using AirDroid and trying to make update,you may need to click the refresh button to make the newly-updated contact sync to AirDroid.