I'll say it! I'm a worry wort! I check my tamas every minute or two! But, when you have 4, you have to keep a close tab on all of them, so you have to check more often.
I check on my tamas when one of them beeps and I fill up the hearts on all the others as well after that (I have 4 too! ). Unless I'm really bored and then its practically every couple of minutes.