How long do i get to own mobile education if I purchase it?
Forever. If you purchase it, you can study/watch it as often as you want.
What if I redeem it with coupon using faithlife connects?
"You'll receive codes to redeem courses of your choice. Codes are valid for one year from the date issued. You'll maintain access to the course for six months from the date you redeemed your code."
Source - https://connect.faithlife.com/courses
You'll maintain access to the course for six months from the date you redeemed your code.