I think it varies for everyone - for me, it's instantaneous. I wonder if you are pushing too hard for your fitness level? If you do too much, too fast you may be wearing yourself out too early. That's a bad idea, in general, because it may discourage you from exercising in the future...you start associating pain and exhaustion with exercise, and soon enough, you don't want to do anything at all.
If you aren't pushing too hard, do make sure you're eating enough. Your body is like a car - it needs fuel to run. If you don't give it fuel, you'll stop running eventually. So make sure you're fueling those workouts with healthy foods and that you're exercising at a level appropriate for your fitness. A good guideline? You should be able to talk while working out, but not sing. If you can't talk, you are working too hard. If you can carry a tune, pick up the pace!
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