As of today I am seeing that the max selectable duration for a sponsored ad is now 18 days, down from 28 previously.
This is a pretty handy scheduling feature so hopefully this is an easily rectifiable bug, and the limit hasn’t been reduced arbitrarily. If it’s precipitating a change in the sponsoring system, that would be good to know in advance too.
Expected behavior
Should be able to schedule ads for 28 days max