A jail term for a bus driver behind the wheel of a horror crash that killed 10 wedding guests was wrongly taken "into the stratosphere", appeal judges have been told.

Brett Andrew Button, 60, was driving too fast while under the influence of opioid painkiller Tramadol before his bus tipped, killing 10 people and injuring 25 others in June 2023.

He was jailed for 32 years with a non-parole period of 24 years for the crash in Greta in the NSW Hunter Valley.

But there had been double counting between the 35 different criminal charges to which Button pleaded guilty, his lawyer told a panel of three appeal judges.

"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 submissio

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