Just made a lhr-khi-lhr trip.
Left 11 AM from Lahore, reached multan 2pm, refilled fuel and tummy, back to m5, reached sukkur at 7 pm with slow drive. after that n5, till khi, reached khi at 3 AM night. Over all experience was good on M5, service area only operational for namaz and washrooms.
From Khi, left 530 am monring, reached M5 at 2:30 PM, after that multiple sessions of heavy fog near multan, jaranwala, and shiekupura. Reached Lahore at 12:30 AM night.
Tried to remain within limits, and a break of 10-15 minutes after every 100 kms, bcuz i was only driver.
Avg travel time khi-lhr and lhr-khi is 14-15 hours.
Earlier when i used n5 for complete route, it consumes 20-22 hours of drive.
I hope after Hyderabad-multan motorway, this travel time should reduce to 12-13 hours.
Car used was Corolla Altis 1.6. Fuel consumed approx 2.5 tanks.