After your website launches, you will need support - answering questions, making software updates and enhancing your website. Drupal is an immensely powerful content management system and does require a certain level of maintenance to keep up with Drupal core and contributed module updates (especially those related to security).
The launch of any Drupal website project should not be viewed as the ‘end of a project, but rather the beginning of a new phase of the site. When launched, Drupal websites and web applications will need to be supported, maintained, analyzed, improved and extended as required. Every client’s web project has different post launch requirements depending on the complexity of the site, custom features, integrations, clients support staff size etc. To meet the varied requirements, LevelTen has created annual “BLOCKS” (of hours) for each client to work from at their own pace.