Getting the length of prediction time horizon

T.py

n_of_wkdays = pd.date_range(start = pd.to_datetime(end_date, 
              format = "%Y-%m-%d") + pd.Timedelta('1 days'), 
              end = pd.to_datetime(pred_end_date, 
              format = "%Y-%m-%d")).to_series(
              ).map(lambda x: 
              1 if x.isoweekday() in range(1,6) else 0).sum()
T = n_of_wkdays
print(T)