I have 3/4 mile for mine. When we first built it was dirt, which was a mess. After a couple of years we spread 500 tons of modified. **** on the snowblower, but it got better each year. Every year I added 3-5 tons to fill in ruts and washouts. After 12 years we scraped together enough money and blacktopped it 8' wide. Nice thing was that all of the gravel was a good base and the paver did not need to redo it, just scraped it flat. Since then (16 years) little to no maintenance. Paving is the way to go, but it does take money.
paul