There’s no typical time for SCD. I would seriously, seriously look into it if I were you. Contact Esther Weiss at Digestive Wellness. They have started charging for mentoring. It might be worth it, or you might be able to find an “SCD Buddy” via some of the email groups, like KosherSCD.
And yes, Crohn’s hits the digestive system at different parts, and in different ways, so the permutations are different and the medical cocktail combos prescribed vary, but there is a real possibility of at least avoiding the biologics with SCD. (Of course you should continue your meds, even on SCD.)
Hatzlacha and refuah shleima!