Question A cube of blocks respawn after time or after being 50% broken 1.21.1

[torment]

to make on my server a mining cube of ores for example 9x9x9 cube of diamond ore and players have to mine it i want to make that if the cube is broken more than half it will resets or it will reset after a given amount of time
if this helps i use aternos 1.21.1 papermc and i have these plugins
AutoPickup
Chunky
Citizens
DeluxeMenus
Essentials
EssentialsXSpawn
LuckPerms
PlaceholderAPI
Shopkeepers
SimpleTpa
SkinsRestorer
spark
WorldEdit
WorldGuard
thanks in advance