conftest.py

import time

import pytest


@pytest.hookimpl(hookwrapper=True)
def pytest_fixture_setup(fixturedef, request):
    start = time.time()
    yield
    total = time.time() - start
    with open("/tmp/log", "a") as io:
        print(f"{total:.2f} {fixturedef.argname}", file=io)