I know that some microstocker (hi, Rinder) always argue that you don't have to spend more than X minutes on each shot, otherwise it is not "worthy".
Personnaly, I'm also a hobbyist and I don't care that much on how much time I spend on a shot... but definitively more than what I should
I also do quite a lot of 3D and this is a completely different beast... how much time spending on modelling an object assuming that it is then reusable?
Anyway, I do not fully agree on the X minutes things as what make stock photo business quite special is that you are not paid for the time you spend at work, but for how good is your work. So, the most important is to produce good work and not to know how much time you spent at producing it IMHO.
If your average monthly earning per photo is $3 and you assume that a given photo will sell for 2 years (?)... an average good photo will earn $50-100 throughout its "life". This is worth more than 10 minutes work I think, unless you expect to be paid $500 per hour of course.
Now, concerning your question... do I qualify for my own definition of success? I guess that what make me still an amateur and not a pro is that I agree to answer to the question ;-) Yes, I qualify.
I know that you are not supposed to give precise figures when you are a pro (are you?), but it is not that difficult to roughly estimate how much earn any microstocker... we have all the information neccessary