The man behind one of Australia's deadliest bus crashes is set to learn if his decades-long prison sentence is to be shortened.

Brett Andrew Button, 60, is serving a 32-year jail term for causing a crash that killed 10 wedding guests and injured another 25 at Greta in the NSW Hunter Valley in June 2023.

He was driving too fast and under the influence of the opioid painkiller Tramadol before his bus tipped.

Button has appealed the length of his sentence, with his lawyer arguing some of the 35 criminal charges he pleaded guilty to had been double-counted.

"As catastrophic as the consequences were of the applicant's dangerous driving, the aggregate sentence imposed was manifestly unjust and unfair," Paul Rosser KC wrote in submissions filed with the NSW Court of Criminal Appeal.

Button a

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