I often end up gardening for many hours once I get started. One thing leads to another! I think: "I'm just going to pull weeds out of this bed here," and then I realize there are weeds coming up in many different places, and I should really trim some things back, and deal with some ants, and haul some brush away and clean around the firepit, etc. etc. Next thing I know, it's well past sunset! (But it's a great time to listen to audio books.)