To clarify, both prestige and honour can contribute to being considered Legendary Hero. You don't have to gain that h/p while you are hero class. Lefanis's suggestion given, 25 prestige and 100 honour, does qualify as legendary, but it does not have to be those specific amounts of h/p to qualify.
To clarify slightly further, it's not a set amount of honour and prestige, but a moderately complex formula.
So research away!
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Timothy Collett
"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan