I agree with what was previously said. It will be time-sensitive but worth it if you implement a system to update your sitemap automatically in the future. Also, a solution might exist for your platform that will save you time.

Dividing your sitemap using a sitemap index will also 1. help diagnose possible indexing problems via Webmaster Tools 2. force you to review your site architecture which can lead to valuable insights to improve your site.

Relevant article on the subject: http://www.distilled.net/blog/seo/indexation-problems-diagnosis-using-google-webmaster-tools/