How to measure certain load time between 2 actions

Dear LoadComplete support,

I am a new beginner of LoadComplete and i would need a solution of this test:

Teststeps:

1. start testapp

2. enter some msg. on testapp1 and press "Send" button

3. wait until confirmation box is displayed

I simply need to measure the time duration between send and confirmation box popup, in Report Details/recorded Scenario there are plenty of recorded items(Request/Response), how can i easily measure this timeframe, and is it possible to put a checkpoint in there? e.g. if sendtime 3 sec. exceeds then throw a warning.

any Answer would be appreciated, thanks.

Lee