As I have said before, I think a few hours works best...enough to get a job done, while not getting overwhelmed with too much. Have things to bring to donate to a charity at the end? Put them either boxed up or bagged into your car so you can deliver them there soon. Stuff to ditch? Get it out into the trash. Stopping mid-way through the task can sometimes cause upset as the area may look even worse than when you started. Yes, pulling EVERYTHING out of a pantry or closet is the way to start, but you need to keep going from there to get the job done. Keep on task rather than getting distracted by the phone or the mail being delivered. Give yourself more calm in your life by allowing time to do some decluttering and organizing each day. Even a small area, like getting a kitchen counter cleared off, is something that can add up to make a big difference.