The long-legged buzzard may lay a variably sized clutch. Typically 2 to 4 eggs are laid but from 1 to 6 egg clutches have been documented. The average clutch size in the Ukraine was 2.7, in a sample of 8. The same clutch size mean was reported in Cyprus as well. The average clutch size in North Africa was reported (in a sample of 57) as 2.54. The clutch size in northwestern Iran averaged 3. In northwestern China, the mean clutch size was 3.3. The eggs are slightly rough, oval and largely whitish with a yellowish tint and a few wart like projections, with indistinct gray-brown to reddish brown markings, which tend to fade at the pointer tip of the oval. The average egg sizes in the Ukraine, Armenia and northwestern China were , and , respectively. Egg heights ranged from and diameter ranged from , while in Armenia eggs weighed on average and in China they weighed . Incubation appears to last for about 28 to 30 days.