Re: Star Trek Online Discussion Thread (now free to play!)
The only way I know of is to look under the Journal Logs, the right most tab in your journal UI. It shows the last time you ran the mirror event, so you can use that to figure out if 20 hours have passed. And yeah I wish Cryptic could design a better UI for doing this.
"Everything should be made as simple as possible, but no simpler." -- Albert Einstein