class UncoupledDynamicGearbox(QCAlgorithm):

    def Initialize(self):
        self.SetStartDate(2020, 5, 23)  # Set Start Date
        self.SetCash(100000)  # Set Strategy Cash
        
        self.AddEquity("SPY", Resolution.Minute)
        
        self.bought_time = None


    def OnData(self, data):
        if not self.Portfolio.Invested:
            self.SetHoldings("SPY", 1)
            self.bought_time = data.Time
            

    def OnEndOfDay(self):
        self.Plot("Days Held", "Number of Days", (self.Time - self.bought_time).days)