What matter is doors open, not on stand. Many software scrape sites such as EF use the in block time, simply because all airports publish that, and that's typically 2 minutes before doors open, slightly longer in some places where there are customs paperwork "competent person" requirements, such as USA and Canada. And yes on longhaul it's £260 for 3 hours, £520 for 4 hours. The RTW ticket makes no difference. The EF code is less important than what you were told by the flight crew.