Using DLC helps a lot with build time, our docker build job takes on average 3mins instead of previously 14mins.

But currently the DLC volumes are only retained for 3 days, which leads slower much slower build time if no build was lunched in previous 3 days.

This is more a connivence issue, and not critical, but i think it would be easy to make it configurable, or at least increase it to 4 days to avoid slow builds after each weekend.