The X1 aircraft is comparable in size to a small regional airliner and can achieve a maximum takeoff weight exceeding 25,000 pounds with the help of four wing-mounted electric motors. The battery-electric propulsion system delivered more than one megawatt of power during the maiden flight.
A 4-seat Cessna 172 burns 8 gallons of 100LL fuel per hour, so 4 gallons in 30 minutes. That fuel costs $7 per gallon at best. 4 gallons times $7 means it costs $28 for 30 minutes. That’s roughly $1 per minute for the lightest aircrafts.
Some fuels are cheaper but they also get burned at a higher rate, so exact numbers depend on many variables.