As requested on the comments, I have added the ability to override the clock speed to make it more customisable for each player.
As it says in the description now, if you open the config.json file you can set the MillisecondsPerSecond value to a custom value.

700 - Default stardew speed
1000 - Clock ticks in seconds
1400 - Day is twice as long as Stardew default
2000 - Clock ticks every 2 seconds

I'm sure you get the point.