OK did a quick comparison between inspire 1 with the T48 vs the T47 vs a PV+. here are the results:
Steady hover, ~6 ft elevation, temperature ~38 C, sunny.
PV+ From 95% to 28%: 14:12
T47 From 99% to 28%: 12:43
T48 From 99% to 28%: 15:34
T48 seems to give a 23% flight time increase with 30%...