In the base game, there is a 12 hour cooldown after one murder ending before the murderer can start planning its next one. This mod edits the timer and has a config to allow one to customize the cooldown.
Murders themselves take time, so you may not see the difference clearly on larger maps. This mod defaults to 2x speed, but I have tested it on 25x speed. This is a starter mod for me to learn the ropes, so there may be bugs.
The Thunderstore launcher has a built in config editor, this mod will appear as BepInEx/config/m75murdercooldownplugin.cfg. If you are not on Thunderstore, you can manually go to the BepInEx/config folder and edit it there.
The SOD discord for some assistance Venomaus's SOD common for logging BepInEx for existing and having good documentation