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I got a combo pack of bulbs from PetCo which included a waterlily bulb (its rather big, about the size of a quarter and very thick). It took about a week for it to start sprouting, and now its going crazy in my tank. I'm fairly certain I got very lucky with my pack of bulbs, considering only one rotted and now all but one of the remaining are sprouting (two onions, two aponogeton, and one waterlilly). Anyway. Some bulb suppliers guarantee growth in 30 days. You could keep it until then, and if it does nothing, send it in to them and they'll give you new bulbs. I've also heard that they send back higher quality bulbs than the ones they normally sell.
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