@2kayush-125 It's in the tenant settings.
The UI is documented here: https://fusionauth.io/docs/v1/tech/core-concepts/tenants#advanced (look for "Change Password")
The API is documented here: https://fusionauth.io/docs/v1/tech/apis/tenants (look for tenant.externalIdentifierConfiguration.changePasswordIdTimeToLiveInSeconds)
Hope this helps.
Thanks for using FusionAuth!