It depends on the type of cake, the size of the pan, and the depth. I would say do not open the oven door for the first 45 mins. After that I usually giggle the handle to the oven door without opening it (yes, my own little quirky technique, but works like a charm) and see if the cake giggles. Once it stops giggling I pop a toothpick in to see if it is done, and then figure by that how much longer it will take.
I'm smiling a bit right now. Maybe there is something being lost in translation but I am loving the fact that your cake giggles. For me giggling means laughter. I would love it if my cakes giggled--that would mean that they are happy 
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Your technique makes a lot of sense--I'll use it next time I bake a cake.
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