For the base version of GSh-30-1 (9-А-4071К) durability theoretically was 2000 rounds, but in practice it was only 150 rounds.
http://ser-sarajkin.narod2.ru/ALL_OUT/TiVOut10/RuAviGun/RuAviGun037.htm
For the gun designated as “9-А-4071К.00.000-01 with extended durability” I have no data.
http://vpk.name/library/f/gh-301.html
The continuous burst was limited to 35-40 rounds maximum (“long burst”). The recommended “short burst” is 7-15 rounds.