Changing subscription expire days When I go to publication properties and General Tab in that. I see an option

Subscription expire and may be dropped if not synchronized in the following number of days. Replication meta data is kept for this amount of time.


Here some day is set, i.e. 7.

Now I am trying to change this figure to something else, i.e. 20. So If I make this change will the existing subscription reinitialize?
No the subscription will not reinitialize when you make this change.  This setting simply tells the distributor how far behind the subscription can get before the subscription will be automatically expired.