[SDPhantom]

They both work. Registering the timer directly with EVENT_MANAGER directly is more efficient than calling zo_callLater(), but the later is easier to deal with.

This is literally what zo_callLater() does.

local ZO_CallLaterId = 1
function zo_callLater(func, ms)
    local id = ZO_CallLaterId
    local name = "CallLaterFunction"..id
    ZO_CallLaterId = ZO_CallLaterId + 1
 
    EVENT_MANAGER:RegisterForUpdate(name, ms,
        function()
            EVENT_MANAGER:UnregisterForUpdate(name)
            func(id)
        end)
    return id
end

On an added note, if you use EVENT_MANAGER:RegisterForUpdate() and don't unregister the function, it'll just keep calling at the interval you gave it. This is something zo_callLater() simply can't do without calling it more times.