That's my DH's idea and I think it's great! No more stressing about whether what you're feeling is labor or not, or worrying you're going to give birth on the kitchen floor because you are the one woman in the world who doesn't "just know" she's in labor.
Instead you just pop a turkey timer for pregnancy in and when you're wondering if you're really in labor, you just check to see if its popped or not. If it hasn't, you go on with your day, if it has, you go to the hospital. No more timing, guess work, and stress!
I think it's brilliant.