If I remember correctly ( it's been about 3 months since I flew the neo ) the start process is in the area of 3-4 minutes but most of that is a dry motoring cool down process ( even if it's already cool ) so it's really only burning fuel for a minute or so during the start. I could be wrong but I believe that's how it works. I hope PW has fixed the issue because it's a great airplane but I know we blew one of the "new" neo motors up around a month or so ago. The CA said it sounded like this...It's only been flying ETOPS for 10 days now and just one airframe, but so far no issues. It *seems* like PW solved the problems they were having. The only ongoing concern I know of is that start times can be REALLY long (like 4 minutes per engine long), but it's burning about 2.2K per side per hour which is crazy when you think about the fact that it's a 200K airplane.