IF you get to 20-22 it’s time to start looking for adjustments.
On the flip side, IF SPX churns sideways for a week or two and this IC gets to 53 days to expiration and short strike’s delta comes down to 10, this IC may be trading for 1.80-1.70 or 15% of credit (from 2.05 entry), you may consider taking it off then or continue with the same management plan.