Is my crowding mild or moderate? Length of Invisalign treatment? (Photo)

My personal opinion is that your crowding level seems to be marginally moderate. It can take approximately 6 -9 months to align the front teeth using IPR and expansion. If you need further correction of your bite it may take longer.  The clincheck analysis will be a great help for having a better idea. Good luck. BestDr Amir

Your case is definitely in the moderate category of crowding and I would estimate it would require about a year of treatment with Invisalign.  You can have impressions/scans/pictures taken by the dentist who is proposing care and submit to Invisalign for a proposal.  This is called a clincheck.  It would answer many of your questions.Good Luck!

Although the crowding in your upper arch is mild, in your lower arch it ranges from moderate to severe. Count on at least 1 year of treatment.

You have moderate crowding. It's hard to evaluate your bite from those pics though. I'd estimate Invisalign treatment at 12 months. Your upper front teeth appear that they're leaning back too much as well.