How can we help you? How long does the installation take? 1 out of 3 found this helpful Depending on the stair lift model selected, an experienced installer can complete your install in as little as 2 hours. Our Home Access Specialist will test the unit, demonstrate its functions, and stay as long as necessary to ensure that you are comfortable with the operation of your new stair lift. Was this helpful? Yes (1) No (2) Category: General Related Questions How long do the batteries last? What happens in the case of a power outage? What are the safety features on a stair lift? Is the stair lift noisy?