Truggies with 1515 2.5D 1650 kv on 6S 5000-6000 mah - Runtime

For people who have used a Neu 1515 2.5D 1650 kv on 6S 5000-6000 mah (Enerland cells) in truggies, (I know this is a popular 6S choice) what types of runtime have you gotten with this combo when racing? I am going to be racing an 8ight-T on a medium-sized low traction track with 30 minute mains, and I'm wondering if I could get something like 35 minutes with this combo with conservative gearing.

Thanks.