$ python3
Python 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from sympy import series, exp
>>> from sympy.abc import x
>>> from time import time
>>> for n in range(1, 101):
...     t0 = time(); _ = series(exp(1 - exp(x)), x, n=n); print(n, time() - t0)
... 
1 0.05832052230834961
2 0.0792999267578125
3 0.12102556228637695
4 0.142164945602417
5 0.20810937881469727
6 0.2985231876373291
7 0.4627223014831543
8 0.7917144298553467
9 1.592421054840088
10 3.8713343143463135
11 12.383564710617065
12 45.100839614868164
13 175.42633605003357
14 698.1054706573486
15 2677.1742584705353