How long does it typically take to install a stair lift? (straight stairs; two-man crew) 2-4 hours 100% Get Free Quotes Today! Question: How long does it typically take to install a stair lift? (straight stairs; two-man crew) Top Answer (100% of 2 votes): 2-4 hours. Get Free Quotes Today! Find Local Pros Free Stair Lift Installation Cost Estimates Related Questions How Much Would It Cost to Install a Stairlift? How is a stair lift attached to the staircase?Top answer: The stair lift is attached directly to the stairs. Is it possible to install a stair lift outdoors?Top answer: In most cases Is it possible to install a stair lift on a spiral staircase?Top answer: In most cases What is the standard weight capacity of a residential stair lift?Top answer: Holds up to 250 lbs.