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Whilst total integration time is the goal (so lots of short subs vs few long subs is the secondary point), what you're trying to do is
1. swamp the read noise of your camera. Each camera sensor model is different, but you want to ensure you get enough signal to fight against read noise. Remember that when you stack images, you're stacking signal, but also stacking noise (until you remove it).
2. do it to the point (as Martin suggests) that is appropriate for your light pollution level. The general rule is shorter subs in light polluted areas, longer subs in dark skies. I would never shoot 10min broadband subs in the middle of Sydney but would love to in B1-2 skies.
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