Classic ASP do a task every 5 min only 3 times

Good morning, I need in classic asp to make a script using the session variables, do when a certain variable is true, 3 times an action and between each of the times you must spend 5 minutes, I have been thinking for days I would do it without it coming out, any help would be appreciated.

Session("TimesToAlert")=0

if Session("TimesToAlert")<3 then 

    response.write "Hi !"

end if

if alert then
   Session("TimesToAlert")=Session("TimesToAlert")+1

end if