That's very interesting. I've been studying kanji in the morning because I'm a morning person, making it easier in the short run, but it looks like working on it in the evenings is actually better for long term retention.
For kanji, it works best to keep practising them several times every single day. Every 2-3 hours. You'll be able to learn a lot of them, much faster this way. You can use the open source software anki to plan which ones to review on a regular basis.
I'm already using Anki. As for the every 2-3 hours thing, it's hard to fit that into my schedule. There's an Android app called Ankidroid though that I haven't looked into. If it supports syncing with your desktop deck, I'll try to use that to fit in some practice every few hours.
