check this link. You can set it on secondary replication partner
http://www.symantec.com/business/support/index?page=content&id=HOWTO55469
In the console, click Admin, and then click Servers.
Under Servers, click Replication Partners.
Under Tasks, click Edit Replication Partner.
In the Edit Replication Partner dialog box, specify the schedule for replication between the two partners by doing one of the following:
Check Autoreplicate.
It causes frequent and automatic replication to occur between two sites. This option is the default setting. Therefore you cannot set up a custom schedule for replication.
Note:
The Autoreplicate option performs the replication process every two hours. Previous versions of the product automatically replicated every five minutes.
Uncheck Autoreplicate
You can now set up a custom schedule for replication.
Select the hourly, daily, or weekly Replication Frequency.
Select the specific day during which you want replication to occur in the Day of Week list to set up a weekly schedule.
Click OK.