Long Term Standard Visitor visa

[keepsim]

Hi,

Just want to some insight into Long term visitor Visa , if someone apply for 10yr visa as I understand one can only stay for 6 month at max ?

But why does these lines say from "https://www.gov.uk/standard-visitor-visa" say you might be able to stay long if
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You might be able to stay for longer if:

you apply (and pay an extra fee) for a long-term visit visa and you can prove you need to visit the UK regularly over a longer period
you’re coming to the UK for private medical treatment - up to 11 months
you’re an academic on sabbatical and coming to the UK for research - you, your spouse or civil partner may be able to stay for up to 12 months
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Is this AND or OR ?

you can prove you need to visit the UK regularly over a longer period- So if my parents are visiting me because I'm settled here , is this not enough ?

Can a visitor stay for over 6 months for family visit ?

[Casa]

A visitor shouldn't spend more time in the UK in a 12 months rolling period than they are spending in their home country.

[Wanderer]

Two weeks to a months is a visit. Six months is not visiting in my humble opinion, it's temporarily residing.