Just got back from my morning walk, so Pat beat me to it.
With programming (as with much else in life), everything has a purpose. If you pop open a form every hour, there is a question of purpose. You see, forms are generally "action" elements - you DO something with a form. So what is the purpose of opening this form at a specific time? What is your user supposed to do with it? Suppose that the user has to take a rest-room break... Is the form going to stay open until the user comes back? What if the user goes to lunch and happens to be gone 1 hour and 2 minutes - which means the form would open twice? Have you considered contingencies for a user who just minimizes the form because s/he is busy doing something else?
That might have seemed a bit rambling, but that's actually the point. If we have no idea of the context, we cannot give you good advice for what you want to do. We will ramble all over the place trying to decide how to help you do something that might actually be simple but might also turn into a project that is at the level of a Master's Thesis in computer science. So where is this going?
By the way, the more efficient way to do that timer is when it fires and you want to re-trigger it at a specific time, build a time-string to the time you want, then use a DateDiff( "s", Now(), <projected time> ) * 1000 to set the next timer interval.
