There's a ton of info out there about improving picking technique (& I've got a lot of it) but hardly any of it gives advice on exactly how much practice is required to make good progress. Obviously if you only do 1 hour a week on a Sunday afternoon you probably won't improve much, but if you know how to practice effectively, how much time per day do you need to devote to picking exercises to make long-term continuous progress? Also, I wonder how long it takes for the progress you've made to be lost if you don't carry out specific practice for picking? I always seem to hear about well-known musicians who are known for their great technique saying that they don't specifically practice any more, but rather they just play. I've go through phases of really trying to concentrate on picking, but usually end up getting sidetracked by other things (e.g. learning songs) - my technique has got better but I often wonder how much better it could be with a bit of dedicated practice for a few months.