u/Tylerd62 ·
Reddit — r/options
· May 28, 2026 at 01:51
· ⬆ 1 pts
· 💬 5 comments
| View on Reddit ↗
AI Summary
Summary
Single community comment discusses optimizing SPX bull spreads by using 45 DTE entry and 21 DTE exit to capture the most efficient portion of the option decay S-curve.
Dominant sentiment is educational/neutral, but the original thread implies a bullish stance on SPX.
No earnings or specific catalysts mentioned; focus is on strategy mechanics.
Score1
Comments5
▶ Full Post Text
[+5] u/MavofMain: If you are looking to optimize your strategy, consider extending your expiration timeline. Theoretical models imply that option decay accelerates exponentially, real-world decay often resembles an S-curve.
This deviation happens because near-term options carry higher-order Greek risks (like gamma and vanna). To compensate for the fact that market returns exhibit fat tails. 6-sigma moves (Options Market Making by Allen Jan Baird) happen more often than standard models predict and market makers demand a convexity premium. This keeps short-term option prices higher than pure exponential models suggest.
If you want to see data on how this plays out in practice,Tastytrade has published extensive studies on actual vs. theoretical decay. I highly recommend looking at their research on the 45 DTE entry and 21 DTE exit (so you have a similar trade amount), which specifically aims to capture the steepest part of this practical S-curve
Option decay (theta) follows an S-curve in reality, not pure exponential; near-term options carry convexity premiums due to fat-tail risk. Studies by Tastytrade show the steepest decay occurs between 45 DTE and 21 DTE. By entering a bull spread at 45 DTE and exiting at 21 DTE, traders capture the most rapid time decay on the short leg while reducing gamma/vanna risk from short-dated options. For SPX bull spreads, adopt a 45-day entry and 21-day exit window to improve probability of success and align with real-world theta behavior. No counter-arguments in the thread; theoretical models may still misprice tail events. Early exit may leave profits on table if move continues.
This Reddit post, published May 28, 2026,
features r/options community
discussing SPY.
1 trade idea extracted by AI with direction and confidence scoring.