Remove event-block after 40 seconds

[superhyro]

So im trying to make it so when a player places a block in a specific region the event waits 40 seconds and then removes the block how do i do it? i tried this code but it gives an error whats wrong? (if this is even possible)

on place:
    player does not have permission "bypass.cpvp"
    if event-Block is not obsidian or end crystal or respawn anchor or glowstone:
        if "%region at event-Block%" contains "cpvp":
            cancel the event
            send "&c&lHey! &7Sorry, but you can't place that block here."
            wait 40 seconds
            remove event-block

 

[ProxiCent]

idk if this is what you want

on place:
player does not have permission "bypass.cpvp"
    if event-Block is not obsidian or end crystal or respawn anchor or glowstone:
        if "%region at event-Block%" contains "cpvp":
            wait 40 seconds
            set event-block to air