60 minutes will ensure full conversion, however you may get it in as little as 30 minutes.
The longer mash will help break down the sugars to make them easier for the yeast to eat, giving you a more fermentable wort.
Primary 1: Guardrail Pale Ale
Primary 2: Lake Vacation Wit
Primary 3: Air
Secondary:All my secondaries are currently primaries
Keg 1: Old Yeast
Keg 2: Old Yeast
Bottled & Drinking: Commercial Stuff
On Deck: Nada