Justice Matthew Palmer QC remanded the man, who cannot be named for legal reasons, in custody for sentencing on June 6. Justice Palmer issued him with the first of a three strikes warning.
Thanking the jurors for their attention to the case, he excused them from further jury service for five years.
"When you read in the media about verdicts in the future you will have a deeper appreciation of them and know what's involved," Justice Palmer told them.
The man initially faced 50 charges but several were dismissed after the Crown's case concluded.
The jury heard his offending spanned 13 years.
The man's victim spent four days testifying and being cross-examined via closed circuit TV, much of the time sobbing as she recounted events over that time span.
