These things can affect how long it takes for eXact Contacts to sync.
1. Backup your ACT! database nightly,
2. Make sure all your Remote Databases Complete A Sync at a minimum every week, Every Day is suggested.
3. Clear activities, don't leave them hanging out in ACT. Clear them off your Task list, The more uncleared Activities you have the longer iTract will take to sync the ACT! Activities.