For worldwide trips that will be longer than 60 days, you will need to consider specialist backpackers or 'gap year' insurance policies. These also cover extended duration worldwide trips as well as the usual round the world backpacking or year out trip that this policy is typically chosen for.
You will usually find that backpackers travel insurance offers cover for trips of periods up to 12 months; however, some insurers cap their cover at less than this so you should check the terms and conditions carefully to make sure you will be covered.
In some cases you may also be able to extend the duration of your cover should you choose to travel for a longer period of time. Whilst, on the other hand, you may find that insurers are less forgiving when it comes to temporary trips back home for special occasions such as a family wedding or Christmas, and these could invalidate your policy.
Some insurers are now offering cover for up to two trips back to the UK during an extended holiday to cater for their customers who wish to return home for a special event. The maximum time you will be able to spend in the UK for the policy to remain valid is typically no more than 14 days.