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I know rocket fuel crafting time must have been halved sometime in 2.0.x as i have used ratio of 2 blue assemblers to 1 chemical plant in 0.18 and solid fuel crating time was halved in 2.0.7.

However the wiki doesn't list this change.

The Rocket Fuel recipe's InfoBox was updated on the wiki (back in Oct 2024), to indicate crafting time reduced from 30 to 15, but the change isn't in any change notes. Anyhow, I've updated the 2.0.7 change history section on the Rocket Fuel page: https://wiki.factorio.com/Rocket_fuel

Decreased the crafting time of rocket fuel from 30 to 15.

The other 2.0.7 change was for the stack size (increased from 10 to 20) and that is already shown in the change notes.

Fletch wrote: Wed Oct 01, 2025 12:28 pmbut the change isn't in any change notes.

Rocket ingredients and related items were mentioned several times in the 2.0.7 release announcement, directly next to the stack size change.

Sanqui wrote: Mon Oct 21, 2024 11:04 am Balancing

• Increased low density structure stack size from 10 to 50.
• Increased beacon stack size from 10 to 20.
• Rocket part takes 10 times less ingredients than before.
• Rocket silo requires 50 rocket parts to craft a rocket instead of 100.
• Increased rocket fuel stack size from 10 to 20.
• Decreased the crafting time of rocket ingredients.
• Decreased the crafting time of solid fuel.

eugenekay wrote: Wed Oct 01, 2025 1:46 pm [*]Decreased the crafting time of rocket ingredients.

That's horribly ambiguous

A rocket's ingredients are explosives and iron plates, neither of which had crafting times change.
A rocket part's ingredients include LDS and Rocket fuel (where crafting times were halved in 2.0.7, along with other things such as solid fuel whose crafting time change was explicitly called out in the change notes). Rocket parts also require processing units as an ingredient, whose crafting time didn't change.

Rocket fuel is used for other things besides just making the rocket-parts... it is used as ingredients for uranium fuel and satellites (in vanilla), and also just as "fuel" to power vehicles or burn in a furnace. Its easier for all if the notes are explicit: "changed X from Y to Z", and let the players figure out what the impacts of that recipe change is for any downstream processes.

The wiki pages for the two recipes list the changes in more detail. The official changelog doesn't usually change after the fact, so it'll stay the same (slightly ambiguous).