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TTL

Changing things in cache are given a time-to-live (TTL) of 24 hours by default. Changing things are artifacts for versions ending with -SNAPSHOT, Maven metadata files listing available versions, etc.

There are two ways to change the default value:

1. set COURSIER_TTL the environment variable
2. set coursier.ttl JVM property
   (NOTE: if you use Coursier via SBT set lmcoursier.internal.shaded.coursier.ttl property)

Both settings are parsed with scala.concurrent.duration.Duration, so that things like 24 hours, 5 min, 10s, or 0s, are fine, and it accepts infinity (Inf) as a duration.