Bellow 12 Min years

[RobKatt]

Speeding up time multiplayer is something i feel is missing, particularly when aiming for shorter sessions with friends yet still desiring progression. With the introduction of the new timekeeping system, allowing for a faster rate than 12 minutes per year would be a great QoL

[Eddi]

unfortunately there's a number of technical factors that prevent speeding up.

[2TallTyler]

To expand on this slightly: Days in OpenTTD are 74 ticks long. The current tick of the current day (called “date_fract”) is exposed to NewGRFs, so to slow down time we simply increment the date_fract less often. But to speed up time, we’d have to skip some date_fract values, potentially breaking NewGRFs that rely on date_fract to always advance from 0 to 73 and then looping back to 0.

This is the main issue preventing a faster calendar speed.