How long did the effects last after your second Rejuran session?

It has been about 8 weeks since I received my second Rejuran session, and I can definitely say my skin is less rough than before, and makeup applies better. I am particularly satisfied because the feeling of my skin folding into fine lines when I smile, which used to be caused by internal dryness, has significantly decreased. However, I am curious how long these effects will last. Since it seems to be working right now, I am debating whether to get a third session immediately or wait and see a little longer. For those of you who have had 2 or 3 sessions, how many months did it usually take for your skin to start feeling rough again?