Yes. Goals are very personal. The number of goals you have at a time depend on longevity of the goals, the difficulty rating, and the resources (including time) you have, and THEN it's all dependent on what YOU can handle.
I have a few "goals" that I do not have set times for because I do not want to work on them right now. These are to do a backbend, the splits, and handstands. These are goals, but not goals I am specifically working towards yet, just things I want to do some time.
In comparison, I have bigger term goals- goals for the end of the year. I want to drop my body fat to 19% MAXIMUM on every body fat test I take online (circumference method). That's my only BIG 2013 goal.
My smaller goals are monthly. I don't do well with weekly goals anymore- they're too short to form a real motivation for me. They're things like earn x sparkpoints, go to the gym x times, lose x lbs, track food x days... I'll have 5 or so goals that way, but they tie together. Going the gym and tracking food earns me sparkpoints and contribute to the weight loss!