I mean it's a little slow, you can pause this and have dinner, come back and finish it up, but I don't think it's a bad thing.
You don't rush through a beautiful poem and then toss it aside!
And this is a beautiful film. The songs are very well crafted and Ben Dickey and Alia Shawkat give compelling performances.
Hawke is an adept film maker, his use of imagery was interesting and I felt he captured the laconic atmosphere of singer songwriter movement in the south during the seventies and eighties.
I bet Hawke could make a decent western, no problem.
If you have the time to invest and a interest in music this movie will reward you.