After building (i.e. approx disk requirement):
$ du -s linux-* 1958492 linux-5.4 1964612 linux-5.5 1972724 linux-5.6 2118372 linux-5.10
rpi-5.4.y git://github.com/raspberrypi/linux
$ git describe 93349cdffc3fbb446c7c1fc7354215a5b8e30b97 v5.4.83-1256-g93349cdffc3f
rpi-5.5.y git://github.com/raspberrypi/linux
$ git describe 96a3278497cc6540d32dc4a7dba9100da6df16f0 v5.5.19-623-g96a3278497cc
rpi-5.6.y git://github.com/raspberrypi/linux
$ git describe ff0aa78166a59d44bc8d472386699624c8db6da5 v5.6.19-807-gff0aa78166a5
rpi-5.10.y git://github.com/raspberrypi/linux
$ git describe 7fb9d006d3ff3baf2e205e0c85c4e4fd0a64fcd0 v5.10.27-627-g7fb9d006d3ff