We had a 75 minute schedule change on our NBO-LHR flight - I asked for a change to our connecting JNB-NBO flight by one day, not moving the revised NBO-LHR leg. I was asked twice to pay for the change but after finding a note online about KQ policy they finally agreed to the change I wanted FOC.
I found the policy with a quick google search, f-r-w-a-b if you can’t find it let me know and I’ll dm it to you. Good luck 🤞