Document MiniMax R2V local duration ceiling

optimized/image-to-video/minimax-h3-r2v-master/README.md

@@ -76,6 +76,10 @@ non-Heretic `AWQ` text-encoder path.
 - `scripts/queue-minimax-r2v-duration-sweep.mjs` uploads the bundled scene +
   character refs and queues the `2s/5s/8s/12s/15s/17s/20s` duration sweep with
   first-pass steps set to `8` by default.
+- On the current `8 GiB` test box, the corrected default-reference sweep
+  completed successfully through `17s`; the `20s` run failed with a GPU
+  out-of-memory error. Treat `17s` as the current verified upper bound for
+  this exact local setup unless the workflow or hardware changes.
 
 ## When to use this
 
@@ -101,3 +105,5 @@ non-Heretic `AWQ` text-encoder path.
   `references/default-location-reference.url`
 - Default bundled Subject 1 character reference:
   `references/default-character-reference.jpg`
+- Verified corrected-reference duration sweep on `2026-08-22`:
+  `2s`, `5s`, `8s`, `12s`, `15s`, and `17s` passed; `20s` failed on VRAM.

optimized/image-to-video/minimax-h3-r2v-master/prompt-guide.md

@@ -33,6 +33,10 @@ Key points worth preserving:
 - Prompt length limit is `7000` characters.
 - Official duration is `4-15` seconds, but this local workflow should still be
   planned around one clean `10s` beat per generation block.
+- Local corrected-reference testing on `2026-08-22` showed this maintained
+  workflow completing through `17s` on the current `8 GiB` machine, while
+  `20s` failed with GPU out-of-memory. Treat `17s` as the verified local
+  ceiling for this exact setup, not a universal MiniMax limit.
 - MiniMax explicitly recommends describing the relationship between references,
   not just listing disconnected visual details.
 - Camera guidance can be embedded directly in the prompt; their docs call out
@@ -58,6 +62,8 @@ Key points worth preserving:
   explicitly assigned as the environment.
 - Keep one coherent action beat per `10s` block.
 - End each block in a state that naturally feeds the next continuation shot.
+- If you need the safest local duration target, stay at `12s` or below; use
+  `17s` only as the tested upper bound for this box.
 
 ## Recommended prompt order