The usual time frame offered for business or holiday travel is for no more then 90 days. As far as I can tell this is not true- It is up to 6 months. But the best way to check for the most recent info would be:
http://www.ukba.homeoffice.gov.uk/visitingtheuk/visitors/eligibility/
If you are coming to the United Kingdom as a general visitor you are allowed to stay for up to six months. This section explains the different types of general visitor and what you are allowed to do as a general visitor to the United Kingdom. If you intend staying for longer than six months you need to look at the residency or working in the UK sections of this website. For information about the requirements you must meet to be allowed to enter, or pass through (transit), the United Kingdom and what you can expect when you arrive at our border, see Travelling to the UK. Our service standards set out how quickly we aim to decide applications for coming to the United Kingdom as a visitor. The service standard is that we will decide 65% of applications within four weeks. Source: http://www.ukba.homeoffice.gov.uk/visitingtheuk/
he or she can stay for as long as they wish.as long as they don't try to start a family,a job or any form of life on this side of the Atlantic they are ok.
how long can one be on holiday in the UK without a visa
How long a US citizen can stay in European nation without a visa depends on the nation the citizen is staying in. Most nations require a visa simple to enter the nation.
You can travel without a visa through the Visa Waiver program for 90 days or less only.
Citizens can legally stay forever.
90 days
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Jamaicans can stay in Singapore for up to 30 days without a visa.
They couldn't legally cross into the UK without the correct visa. If you're talking about an illegal immigrant - they will be deported as soon as the authorities make the arrangements to send them back where they came from !
A Polish national is REQUIRED to have a visa to enter the U.S. So, without a visa, a Polish citizen cant enter the US at all- period (never mind how long he can stay).
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6 months
you can stay upto 2months but can renew your visa for an extra month which will cost approximately 500DH.hope this helped.
How long can you stay in the USA on a esta visa
You can stay in Sweden for 3 months without a visa.
6 months without a visa