Upvote:4
The maximum time you can spend in the UK with a long-term Standard Visitor visa is 6 months on each visit https://www.gov.uk/standard-visitor-visa There is no restriction on the number of times you can enter using this visa however you should avoid giving the impression of using a visit visa to effectively live in the UK (see Immigration Rules v4.2 https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-v-visitor-rules) The typical rule of thumb is to spend at least the same amount of time outside the UK as within it. If you try to use the visa-free entry route to make frequent/extended visits you will probably run into a problem with Immigration relatively quickly.