4 ms·But LHR does 30-50 flights per hour. 60 seconds is a lot of time...by martinald 9y agoBut LHR does 30-50 flights per hour. 60 seconds is a lot of time...SeoxyS 9y agoLHR has more than one runway.bb101 9y agoAt any time, one runway is used for take offs and the other for landings. It is a really busy airport operating at near capacity.