def spa_length_in_time(**kwds):
    """
    Returns the length in time of the template,
    based on the masses, PN order, and low-frequency
    cut-off.
    """
    m1 = kwds['mass1']
    m2 = kwds['mass2']
    flow = kwds['f_lower']
    porder = int(kwds['phase_order'])

    # For now, we call the swig-wrapped function below in
    # lalinspiral.  Eventually would be nice to replace this
    # with a function using PN coeffs from lalsimulation.
    return findchirp_chirptime(m1, m2, flow, porder)
Returns the length in time of the template,
    based on the masses, PN order, and low-frequency
    cut-off.