2 to 5 weeks for moths but butter flies live up to 2 weeks the first week they grow up and get cared for and eat after being born in a cocoon and they second week they have kids and get eaten after the babies are laid in eggs and when they hatch they're catepillars and a catepillar changes how long it lives until it turns into a butterfly by how much they eat.
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The Luna moth only live's about a week because it has no mouth and can't eat.
*Source*
http://www.totallybuggin.com/site/1586384/page/836018
a Luna mot usually stays in its cocoon for 2-3 weeks, i am recently hatching one! make sure you mist the aquarium every so often. glad i could help! = )
Depending on species, moths can live for between two and five weeks. They go through four stages in their lives from egg, to larva, to pupa and then to adulthood.