It all depends on how many times you do it! 20 seconds for an edit-compile loop is huge. 20 seconds for a CI build is not as bad, but still bad (if you have doz

It all depends on how many times you do it! 20 seconds for an edit-compile loop is huge. 20 seconds for a CI build is not as bad, but still bad (if you have dozens more). 20 seconds once per machine per dependency version (i.e. there is no rebuild of the dependency until you change compiler flags or update the library) is OK.