Well usually, unless an infection develops it could take as long as a beer normally taKes to carb before it blows....which is around three weeks, if the beer is at the recomennded 70 degree carb temp....
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Revvy's one of the cool reverends. He has a Harley and a t-shirt that says on the back "If you can read this, the bitch was Raptured. - Madman
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Single bottle bombs are hard to predict, but do you know about the trick of putting some of your brew in a plastic 1 liter bottle? Use a clean, 1 liter soda bottle that has been sanitized and bottle that as well when you are bottle the rest of your capped bottles. That way you wan tell how 'hard' the bottle is getting, and how likely you are to get bombs.