from time import time
import pandas as pd
import numpy as np

periods = 40 * 365 * 24
tidx = pd.date_range("2016-07-01", periods=periods, freq="H")

np.random.seed(0)
data = np.random.randn(periods)

ts = pd.Series(data=data, index=tidx, name="HelloTimeSeries")

b = time()

x = ts.array.to_numpy()
n = x.shape[0]
d = dict()

for i in range(0, n, 24):
    d[ts.index[i].date()] = x[max(24 * (i - 15), 0) : min(24 * (i + 15), n)]

e = time()
print(e - b)