This is oddly relevant to me right now. I'm a freelancer, and a scare came up yesterday where one of my main income streams was about to dry out... just after

This is oddly relevant to me right now. I'm a freelancer, and a scare came up yesterday where one of my main income streams was about to dry out... just after going through a summery dry spell and just before the obligatory Christmas dry spell. So, currently? A month, but considerably less once UK tax time comes in January. (In case you're wondering, I've got a couple of more smaller income streams sorted, and as of an hour ago it turned out the main one might not be that dry after all.)