It depends. For some people, X weight by Y date is a great motivator. For others, not so much.
I like a combo of short term and long term goals. I even make charts for them. But I don't hold myself rigidly to time limits - sometimes my body just isn't ready to lose on my timetable, so I adjust a little.
One of my favs is ticking down pounds until I go down a BMI point. I know, BMI isn't for everyone. But it's ONE measure (like a scale) and it's just a type of measure I use for one aspect of weight loss.
For example, right now a mini goal I have is working my way to ~155 lbs, which is a reasonable goal of ~5 lbs down. At that point, my BMI will be under 26. I want to do this in the next four weeks (a reasonable 1.25 lb loss per week). Then after I hit that, I aim for 149 (BMI of under 25). Etc., etc. It ain't fast, but it's steady.
It's small amounts of lbs, and it can achieved in just a few weeks for most people. But I'd figure out what works best for you. Try a few different things out.
