Stella
I don't think Studd is unusual TBH- and I have read more widely.
I think that 7 days would be fine TBH. I take 10 days every 8 weeks as i said, and it was every 12 weeks until the bleeds got a bit too heavy- been doing this for 4 years now under guidance of gynae. he also said that even 7-8 days worth every long cycle would be okay- as long as you have a bleed , which is the important thing.
When HRT was first prescribed decades ago and it was oestrogen only in the main, that's when the problems arose, but now the pendulum has swung the other way- perhaps a bit too much with too much emphasis on having very regular bleeds coupled with high doses of progestins.
My gynae says that because there is evidence now of the progestin-breast cancer risk ( compared to no higher risk with just oestrogen alone) that there is some logic in keeping progestins to the minimum and even going oestrogen-only with regular check ups, though this treatment is not allowed under current prescribing licence.