As the zygote implants at about 7-10dpo, a luteal phase of 10 days or more is plenty of time in which to conceive. Mine were a bit wacky, either 11-13 days or 21-23 days, but that's usually less than the "demanded" 14 days - I never had a 28-day cycle either.

I know that B456 has a short luteal phase and she's currently expecting her second child, so it is do-able.