It can depend on what your Network Usage settings are, I run mine on a 2 day connection, and maintain about 5 days of extra work. You can check 2 ways ........ 1. log on to the WCG site, go to My Grid, and then check result status, set result stats to either Pending Validation, or Vaild - that will show what you have sent back. 2. check the messages section of the client, it you have enough history it will show ... Reporting Foo completed tasks.......
I've had them stack up complete for days before even with the 2 day setting, but usually if you hit the update it will send what ever is ready, also when you shutdown and restart.
Rick