Back in September 2018, Dries Buytaert, founder and project lead of Drupal, announced, 

Drupal 7 will be end-of-life in November 2021, Drupal 9 will be released in 2020, and Drupal 8 will be end-of-life in November 2021. 

You can read the announcement and get further information on this here - https://dri.es/drupal-7-8-and-9

Since that announcement, Cheeky Monkey Media has been in a lot of conversations with businesses of all shapes and sizes, not-for-profit and for-profit, that are currently on the Drupal 7 CMS platform and are considering migrating to Drupal 8.

The first thing everyone needs to realize is the move to drupal 8 will be painful, and almost as expensive as building a Drupal website from scratch.

The second thing everyone should realize is that once they’re on Drupal 8, the move to Drupal 9 will be relatively painless.

As Dries announced in a later article,