Derrick Roberts, who teaches history in the Lochaber area, says he would spend the extra hour-and-a-half from cutting contact time on adapting lessons for children with additional needs.
He says he currently finds himself doing work at home most evenings.
"Sometimes I'm rushing lessons in the evening and at the weekends trying to get things done," he says.
"The 90 minutes would allow me to adapt materials – changing the resources so they fit in the right place.
"I've got my bank of resources but I don't have sufficient time to adapt them."
Mr Roberts says he felt less pressured when he first came to Scotland 13 years ago.
"We were expected to do less of the non-teaching stuff," he says.
"We weren't being chased for every piece of data, we didn't need to know three or four things about every pupil."
He says that when he came to Scotland teachers would not normally be hitting the 22.5 hour limit for contact time and would often have one or two periods a week where they could catch up.
Now he says there is a recruitment and retention crisis, not enough supply teachers, more posts unfilled and more "please takes", where teachers are asked to fill in for colleague.
He says more staff are now teaching up to the current limit of 22.5 hours.
"An extra 90 minutes a week would allow a wee buffer zone," he says.