The breeding season of the long-legged buzzard can fall at variable times of the years. In Europe, it tends to breed from March to July. Similarly phenology of breeding is reported in Armenia and even in Iraq. In the United Arab Emirates, a nest with eggs which must have been laid in December was reported, with pair occupancy lasting to at least March. In Morocco, nuptial displays begin in January and February, peaking in March, with egg laying usually from March to April in the northern part of the country and from February to April in southern part. Elsewhere in North Africa, breeding seems to fall somewhat earlier from February to March, with possibly fledging completed by the month of May. The nesting period in Pakistan is about March to July, but records of eggs as late as June may refer to second or replacement clutches being laid. The nest is a large pile of sticks and branches, typically lined with green leaves, twigs, straw and wool. Nests are fairly large structures, averaging around in diameter, as in Bulgaria and Kazakhstan, respectively, but could easily exceed across in some cases. The average depth was , ranging in Bulgaria and Kazakhstan from in depth.