I changed from 30' to 35' cause a couple times I needed the extra length - especially if pitching the tarp lines below the hammock tree straps. Also, carry a couple 4' amsteel dogbone extensions strong enough for either the hammock or the tarp.
"Climb the mountains and get their good tidings.
Nature's peace will flow into you as sunshine flows into trees.
The winds will blow their own freshness into you, and the storms their energy,
while cares will drop away from you like the leaves of Autumn."
— John Muir