A heat gun or hair dryer should get your pickguard ready to begin lifting in about a minute, more or less.
Much harder to give a time for heating a bridge--there are too many variables. I usually take bridges off cold on older guitars, using an appropriate knife to separate the bridge from the top. It's not a technique that I think I can describe adequately here.
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"Still a man hears what he wants to hear, and disregards the rest."
--Paul Simon
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