boodle glad to hear the result was ok, although you had to wait an extra day for it. Now hoping that you'll get an about doubled value today!
cheepz well extra-long but regular cycles can be due to a very long luteal phase and/or late ovulation. The luteal phase can probably only account for so much, as I haven't heard of any that last longer than 18 days. So even if her LP was at the upper extreme, that would still mean she is ovulating late, i.e. on/around CD 24. At least a long LP is no reason for worry - it's when your LP is too short that you have trouble conceiving.
More likely the main reason is delayed ovulation. I read something very helpful about that recently... now where was that? I'll post a link if I remember. The main gist was that ovulation basically needs LH and FSH at high levels to occur. Now there are various possible reasons why those two hormones don't rise, it can be due to these hormones themselves, or due to the hormones which make these hormones start, or even to that part of the brain that makes these hormones that start the other hormones start. So, overall it seems like you cannot know the real cause without undergoing intense testing.
What you can do on the other hand, is try to stimulate your FSH and LH. You need Estrogens for that, and natural estrogens are found for instance in sage and in raspberry leaf. In German speaking countries, herbal lore seems to be more widespread still, and many many women who are TTC will drink herbal teas built around sage and raspberry leaf pre-ovulation, switching to teas based on lady's mantle (gestagen) post-ovulation.
The other possibility I'd mention is agnus castus. I never took it and don't know the details of how it works, but it is said to be cycle-regulating. I.e. short cycles tend to become longer, long cycles tend to become shorter. It is powerful stuff but it doesn't work for everyone and some people get exactly the opposite effect from what they were trying to achieve. But others swear on it and are so glad that their forever-cycles have come down to a more manageable length; or their ultra-short cycles have lengthened to a level where it becomes more feasible to conceive. It's fairly common for treating PMS and symptoms of approaching menopause, so you can buy it lots of places, for instance Boots have their own brand, which is quite cheap.
I'll repeat that I'm not providing medical advice. Herbal stuff is not "safe because it's natural" - anything that can have the desired effect can also have undesired effects. But everything I mentioned is freely available over the counter without prescription. Please do read the leaflet, whatever you do.
If the cycles are long and irregular, the same is true about ovulation as above, but an additional possible cause or issue to worry about would be PCOS. That can be checked for fairly easily by a GP. It's always good to have that worry off your mind, so perhaps you could tell your friend to talk to a GP about it. It can be treated and PCOS women do conceive and have babies - MrsR can tell you more about that.