well we set some variable so we can keep track of the delay. In fact, if the variable is set, then the user still has a delay, if not set, then he can already use the item
I apologize if something is not quite correctly described, I do not know English perfectly

--- Double Post Merged, Oct 4, 2022, Original Post Date: Oct 4, 2022 ---

As for the variable itself, usually the '-' symbol is put in the 'Skript' config so that variables with this prefix are not saved on disk, only in RAM. That is, after a server restart, all player delays will not be saved
Value in Skript's config

Code (Text):

1.      
2.     default:
3.      
4.         type: CSV
5.      
6.         pattern: (?!-).* # <== here
7.      
8.         file: ./plugins/Skript/variables.csv
9.      
10.         backup interval: 0 hours

--- Double Post Merged, Oct 4, 2022 ---

but I still prefer to use the second variant of code than the first one you mentioned
Just do not forget when the player exits to free memory from this:

Code (Text):

1. on disconnect:
2.   delete {-p::%uuid of player%::*}