Timer for a certain section

I have a point-and-click system for my mod (you can view it here) and for one section with this, I want to have a timer that gets canceled once you find something important, but if you don't find it in time, something else will happen.

what can I add to the code below to make this possible?

init -1 style explore_button:
    background "#6464646c"
    hover_background "#ffffff6c"

init -1 style explore_text:
    font "mod_assets/fonts/Unitblock-mLAwm.ttf"
    size 25
    color "#ffffff6c"
    text_align 0.5

init -1 python:
    """
    for all screens: style_prefix "explore"
    button template:
        button xcenter x ycenter y xysize (width, height) action ButtonAction(next_location, dialogue, or save_var)
        text "label" xcenter x ycenter y
    """
    class TrackCursor(renpy.Displayable):
        #class form here: https://lemmasoft.renai.us/forums/viewtopic.php?p=340355&sid=4540fae3b4ed740ce81e66660e093648#p340355
        def __init__(self, child):

            super(TrackCursor, self).__init__()

            self.child = renpy.displayable(child)

            self.x = None
            self.y = None

        def render(self, width, height, st, at):

            rv = renpy.Render(width, height)

            if self.x is not None:
                cr = renpy.render(self.child, width, height, st, at)
                cw, ch = cr.get_size()
                rv.blit(cr, (self.x - cw / 2, self.y - ch / 2))

            return rv

        def event(self, ev, x, y, st):

            if (x != self.x) or (y != self.y):
                self.x = x
                self.y = y
                renpy.redraw(self, 0)

label explore(start, transition=False):
    show screen quick_menu
    if transition:
        with wipeleft_scene
    $ codes = []
    $ explored = []
    $ renpy.call_screen(start)
    return

label next_location(loc, transition=True, f=False):
    scene expression "bg [loc]"
    if f:
        show screen flashlight
    if transition:
        with Fade(0.25, 0.0, 0.25)
    $ renpy.call_screen(loc)
    return

default inventory = []
default explored = []
default party = []
default code = ""
default dial = ""
default prev_loc = ""
default to_input = ""
default codes = []

label dialpad(c, p, s):
    $ code = c
    $ prev_loc = p
    $ dial = ""
    $ to_input = s
    call screen code_input
    return

screen code_input:
    style_prefix "explore"
    add "vignette"
    text "[dial]" xcenter 640 ycenter 140
    button xcenter 750 ycenter 580 xysize (75, 75) action [If(dial == code, AddToSet(codes, to_input)), Call("next_location", prev_loc, False)]
    text "ENTER" xcenter 750 ycenter 580
    button xcenter 530 ycenter 580 xysize (75, 75) action SetVariable("dial", "")
    text "CLEAR" xcenter 530 ycenter 580
    button xcenter 640 ycenter 580 xysize (75, 75) action SetVariable("dial", dial + "0")
    text "0" xcenter 640 ycenter 580
    button xcenter 530 ycenter 470 xysize (75, 75) action SetVariable("dial", dial + "1")
    text "1" xcenter 530 ycenter 470
    button xcenter 640 ycenter 470 xysize (75, 75) action SetVariable("dial", dial + "2")
    text "2" xcenter 640 ycenter 470
    button xcenter 750 ycenter 470 xysize (75, 75) action SetVariable("dial", dial + "3")
    text "3" xcenter 750 ycenter 470
    button xcenter 530 ycenter 360 xysize (75, 75) action SetVariable("dial", dial + "4")
    text "4" xcenter 530 ycenter 360
    button xcenter 640 ycenter 360 xysize (75, 75) action SetVariable("dial", dial + "5")
    text "5" xcenter 640 ycenter 360
    button xcenter 750 ycenter 360 xysize (75, 75) action SetVariable("dial", dial + "6")
    text "6" xcenter 750 ycenter 360
    button xcenter 530 ycenter 250 xysize (75, 75) action SetVariable("dial", dial + "7")
    text "7" xcenter 530 ycenter 250
    button xcenter 640 ycenter 250 xysize (75, 75) action SetVariable("dial", dial + "8")
    text "8" xcenter 640 ycenter 250
    button xcenter 750 ycenter 250 xysize (75, 75) action SetVariable("dial", dial + "9")
    text "9" xcenter 750 ycenter 250


screen flashlight:
    zorder 1000
    add TrackCursor("mod_assets/flashlight.png")