Help with this timer

RestartTimer = new System.Timers.Timer();
RestartTimer.Interval = (120 * 60 * 100);<<Make this Ever hour?
RestartTimer.Elapsed += new ElapsedEventHandler(RestartTimer_E);
RestartTimer.Start();

Lol what do i put there to make it ever hour im use to just numbers not that

Well there are 1000 MS in one second.
You're looking at 3,600 seconds.

Do the math.

H x 60 = M
M x 60 = S
S x 1000 = MS