In UX writing, as with any documentation, the sooner it's done, the better. Memories fade, so the best approach is to document continuously, noting down details as they happen. For instance, if you're writing copy for a homepage, aim to document each part immediately or even as you’re drafting. This practice ensures no important insight gets lost and keeps your documentation organized and accessible. Delaying this process often results in a chaotic, hard-to-navigate system that’s challenging to update or reference later.