What is the most amount of time you've "lost" to episodes?

By "lost" I mean the length of time you suffered (both high, low, mixed, or both back-to-back), not counting "cleanup" and "recovery" after it's ended.

Example: I lost a month or so to mania, and another 5 months to the depression that followed.

What is the most you've lost? Or however you want to phrase it.