It depends on rider (weight, etc), size of balls, and bike. I personally don't recommend stand-ups both for a beginner and in first gear. First gear is where the most torque is and it's just too easy to loop it. If you want a nightmare story on why you don't want to loop it: a professional stunter in FL looped his bike (GSXR1000) so hard that when they went to see his wreck, all they saw in his helmet were skull and brains........not pretty and definitely sad.
Learn sit-downs first and then move to stand-ups. Standing should only be done in second on. Once you get good, then do stand-ups in first.
Besides, all of those stand-ups you're ending early are killing your forks and seals.