A tracker mortgage rate can last between 1 and 5 years depending on your exact deal, but there are more products at 2 and 3 years. After this, you’ll be put onto your lender’s SVR. There are some lifetime tracker mortgages available, which give you a tracker interest rate for the whole duration of the mortgage, but these are rarer and usually intended for later life borrowers.
When you start to approach the end of your introductory tracker rate (up to 6 months before it ends) you can start arranging a remortgage or product transfer to secure a new introductory rate. This can save you money compared to accepting the lender’s SVR, but it might mean having to change to a new mortgage provider.