NB! It seems this console command is not compatible with CS2.
Command Profile

MP_GGPROGRESSIVE_ROUND_RESTART_DELAY

CS:GO

This command sets how long it takes for an Arms Race (Gun Game) match to restart after someone has won. Default is 15 seconds.

Syntax
mp_ggprogressive_round_restart_delay [Seconds]

Description

This command sets how long it takes for an Arms Race (Gun Game) match to restart after someone has won. Default is 15 seconds.

Syntax And Arguments

mp_ggprogressive_round_restart_delay [Seconds]
Seconds The amount of time, in seconds, that it takes for the game to restart after an Arms Race match has ended.