How long does a follow limit last on Twitter?

[Miranda]

What to do if you've hit a follow limit:
If you've reached the account-based follow limit (2,000 users), you’ll need to wait until you yourself have more followers before you can follow additional users. Follow limits are system-wide; Support cannot remove or adjust your follow limits.
To follow one or two additional users, unfollow a few accounts you're currently following. Please note, however, that regularly following and unfollowing many accounts is a violation of the Twitter Rules and can result in account suspension.

Why Twitter limits following behavior
These limits help us improve site performance and reliability and help us make Twitter a nice place for everyone.

https://support.twitter.com/articles/66885