Interesting. I recently found myself resorting to an old diclazepam and mono propylene glycol mixture I'd made years ago, as I thought there was a chance I could run out of benzos due to having issues with my bank refusing transactions.
I really liked it on this occasion, the long break away from it must have helped, and I felt the anxiety busting properties right through the next day without needing to re-dose. But I didn't know, or had forgotten, that it had a half life of 8 days.
I'm so glad that I kept that mixture now. At one stage the thought passed through my head to get rid of it, as I thought that I disliked diclazepam so much. The previous time I'd used it, it had made me feel very out of it, in a bad way. But another part of me knew that it would be a mistake to ditch it, as I could never know when I might need that mixture and that it's always worth having a back up.