School summer holidays in Wales could be cut to as little as four weeks as part of a shake-up of term times.
Welsh government education minister Jeremy Miles has ruled out cutting the break to two or three weeks or having fewer holidays.
One union said there were "many more pressing issues that need attention".
Mr Miles said public research showed while there was "reasonable contentment" with the timetable there, was "openness" to change.
A public consultation on whether the summer holidays should be shortened is due to begin in the next academic year.
