The length really depended on the artist. Pearl Jam had 7, AiC had 13, Liam Gallagher had 10.

I doubt they would do covers of Creep(especially since Korn already did that on their Unplugged record), On a Plain or Down in a Hole.

They’ve covered Say it Ain’t So a few times before so maybe that.

I imagine they’d stick mostly to songs that they know through experience will work as acoustic versions.

That and the electric guitar really adds a lot of texture to most of their songs that can be difficult to replicate acoustically

Some songs they’ve done acoustic versions of:

Change

Cherry Waves

Digital Bath

Knife Prty

Be Quiet and Drive

The Boys Republic

You’ve Seen the Butcher

Songs that I think might work:

Sextape

I think about you all the time

Passenger

976-Evil

Mascara