Hey Jellyd0nut! I can say that there has been an improvement over time and with practice. It's really difficult to give a precise duration for all my lds because they really vary. But yeah, the super short lds are less frequent, some are in the 5-15 min range which is actually enough to complete a ton of things and run out of ideas, while others can last much longer, say 30 min to an hour. Personally I am quite of a wakeful person so it's hard for me to keep it going for longer than that.

If I have to give any advice regarding how to get longer lds - keep up the overall practices so that you can get more lds and in those lds give yourself fully to the dream. Interact with the dream environment as much as possible, don't let any thoughts and worries ever distract you and follow through with any goals you have set.