gh-80642: timeit - make target time of autorange configurable (#140283)

gh-80642: timeit - make target time of autorange configurable (#140283)

Co-authored-by: Alessandro Cucci <alessandro.cucci@gmail.com>
Co-authored-by: blurb-it[bot] <blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Stan Ulbrych <stan@python.org>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>