... and I just spotted this here: https://bpcreech.com/PyMiniRacer/api/#py_mini_racer.py_mini_...

    call(expr, *args, encoder=None, timeout=None, max_memory=None)

Where timeout is "number of milliseconds after which the execution is interrupted" and max_memory is "hard memory limit after which the execution is interrupted" (it doesn't specify what unit, presumably bytes? - Yes, it's bytes: https://bpcreech.com/PyMiniRacer/api/#py_mini_racer.py_mini_...)