how can I make a timer in vb.net tick at longer intervals say every 10 seconds or even 60 seconds instead of every 1000th of a second

I am writing vb.net application that checks to see if a differnt application is running on the computer
but I dont want my application to check at every tick because that will slow down my computer I only need to check say once a minute or every 30 seconds how can I slow down the ticks so it doesnt slow down my computer