There are 4 commands and 5 permissions that you have to understand if you want to use this plugin:

Commands:
setcooldown:
description: Set the block cooldown time in seconds.
usage: /setcooldown <seconds>
getcooldown:
description: Get the remaining cooldown time.
usage: /getcooldown <place|break>
enableworld:
description: Enable cooldown for a specific world.
usage: /enableworld <worldname>
disableworld:
description: Disable cooldown for a specific world.
usage: /disableworld <worldname>

Permissions:
blockcooldown.setcooldown:
description: Allows the player to set the block cooldown time.
default: op
blockcooldown.getcooldown:
description: Allows the player to get the remaining cooldown time.
default: true
blockcooldown.bypass:
description: Allows the player to bypass the block cooldown.
default: op
blockcooldown.enableworld:
description: Allows the player to enable cooldown in a specific world.
default: op
blockcooldown.disableworld:
description: Allows the player to disable cooldown in a specific world.
default: op