Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Pay 2000 Life Points. After 20 turns have passed after you activate this card (counting the turn you activate this card as the 1st turn), you win the Duel.
--終焉のカウントダウン
--Final Countdown
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCost(Cost.PayLP(2000))
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	aux.GlobalCheck(s,function()
		local ge1=Effect.CreateEffect(c)
		ge1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_TURN_END)
		ge1:SetCountLimit(1)
		ge1:SetOperation(s.endop)
		Duel.RegisterEffect(ge1,0)
		local ge2=Effect.CreateEffect(c)
		ge2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
		ge2:SetCode(EVENT_ADJUST)
		ge2:SetOperation(s.winop)
		Duel.RegisterEffect(ge2,0)
	end)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetProperty(EFFECT_FLAG_PLAYER_TARGET+EFFECT_FLAG_CANNOT_DISABLE)
	e1:SetCode(id)
	e1:SetOperation(s.checkop)
	e1:SetCountLimit(1)
	e1:SetLabel(0)
	e1:SetValue(0)
	e1:SetTargetRange(1,1)
	e1:SetReset(RESET_PHASE|PHASE_END,21)
	Duel.RegisterEffect(e1,tp)
	local descnum=tp==c:GetOwner() and 0 or 1
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetDescription(aux.Stringid(id,descnum))
	e2:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE+EFFECT_FLAG_IGNORE_IMMUNE+EFFECT_FLAG_SET_AVAILABLE)
	e2:SetCode(1082946)
	e2:SetLabelObject(e1)
	e2:SetOwnerPlayer(tp)
	e2:SetOperation(s.reset)
	e2:SetReset(RESET_PHASE|PHASE_END,21)
	c:RegisterEffect(e2)
end
function s.reset(e,tp,eg,ep,ev,re,r,rp)
	s.checkop(e:GetLabelObject(),tp,eg,ep,ev,e,r,rp)
end
function s.endop(e,tp,eg,ep,ev,re,r,rp)
	local eff={Duel.GetPlayerEffect(tp,id)}
	for _,te in ipairs(eff) do
		s.checkop(te,te:GetOwnerPlayer(),nil,0,0,nil,0,0)
	end
	s.winop(e,tp,eg,ep,ev,re,r,rp)
end
function s.checkop(e,tp,eg,ep,ev,re,r,rp)
	local ct=e:GetValue()
	ct=ct+1
	e:GetHandler():SetTurnCounter(ct)
	e:SetValue(ct)
	if ct==20 then
		if re then re:Reset() end
	end
end
function s.winop(e,tp,eg,ep,ev,re,r,rp)
	local t={}
	t[0]=0
	t[1]=0
	local eff={Duel.GetPlayerEffect(tp,id)}
	for _,te in ipairs(eff) do
		local p=te:GetOwnerPlayer()
		local ct=te:GetValue()
		if ct==20 then
			t[p]=t[p]+1
			local label=te:GetLabel()+1
			if label==3 then
				te:Reset()
			end
		end
	end
	if t[0]>0 or t[1]>0 then
		if t[0]==t[1] then
			Duel.Win(PLAYER_NONE,WIN_REASON_FINAL_COUNTDOWN)
		elseif t[0]>t[1] then
			Duel.Win(0,WIN_REASON_FINAL_COUNTDOWN)
		else
			Duel.Win(1,WIN_REASON_FINAL_COUNTDOWN)
		end
	end
end