Hi CC5
You will see any indication of ice accumulation immediately start to build up on the windshield wiper arms and above/below the deiced area of the window.
The problem is if you fly much at night like I do then you will not see the ice building up so I shine my flashlight (torch for Brits) every 5 mins or so at the wiper arms and the wings to check.
In temperatures below -18°c the windshield heat should be turned on if so equipped for birdstrike integrity of the front windshield. The front window is designed to withstand a 2 lbs birdstrike @ Vne 150 kts.
Hope you like flying the B-222? It sure is a nice helicopter to fly.