What can you do to shorten recovery time from a tummy tuck?

For the shortest recovery time following a tummy tuck, I suggest the no-drain or drainless tummy tuck. This requires a special suturing technique called progressive tension sutures.
The no-drain tummy tuck shortens the recovery time, there is much less discomfort, a lower risk of complications, and in my experience of about one tummy tuck a week, the result is a tighter abdomen. In addition, you are not encumbered with the dreaded drains for 5 to 10 days.
If you have a separation of the rectus (six-pack) muscles, exercising will not help this. They must be sutured together. This is generally routine during a tummy tuck, particularly in someone who has had children.Thank you for your question, and good luck.

Everyone heals differently, but you should count on 6 weeks for your recovery. You  need to have an exam to determine if you will need muscle repair. If your abdominal muscles have separated, no amount of exercise will fix that. Be sure to consult with a board certified plastic surgeon. Good luck.