Parliamentary Voting System and Constituencies Bill

Maybe I am a dinosaur too, but I have been listening carefully to what the noble Lord has been saying, and at least with dinosaurs there is perhaps an occasional element of resonance. He also said that his side was not filibustering but are seeking to persuade the Government to change their mind. How many hours does he think it is legitimate to take to seek to persuade the Government to change their mind before he accepts that they are not going to change their mind and that thereafter it is a filibuster?