School days could be extended to help kids catch up on lost learning due to the Covid pandemic.
Education Secretary Nadhim Zahawi told MPs he will look at some "excellent examples" of longer days.
Tory MP Robert Halfon MP - who chairs the Education Select Committee - suggested an extension to the school day will increase educational attainment.
Just last week Rishi Sunak said the Government had “maxed out” on catch-up funding for schools.
In the Budget, the Chancellor pledged an extra £2bn for education recovery from COVID, bringing spending on COVID catch-up since 2019 to nearly £5bn, rejecting calls for more money to help kids catch up on learning.
Labour slammed the Tories for “floundering" and failing to give kids a secure recovery plan.
Mr Halfon told the Commons: "We know from the Education Policy Institute that it increases educational attainment from two to three months, especially amongst disadvantaged pupils.
"We know that a longer school day, according to the department for culture, media, sports, increases numeracy by 29%. So, this increases educational attainment.
"Will he at least consider some pilot schemes in disadvantaged areas around the country where we can have a longer school day?"
Mr Zahawi replied: "I think the priority has to be for those children and students, who have the least time available to them to recover, which is why the £800 million for the 16 to 19-year-olds additional 40 hours of education is so important.
"Plus the £1 billion going into secondary and primary, making the total £5 billion of recovery money.
"There are some excellent examples... of a longer school day which I'm going to look at.
"The average school day now is 6.5 hours and I would like to see everybody move towards that average."
Shadow Education Secretary Kate Green said: "Children have already had 115 days out of school, missing out on learning and time with friends. The Conservatives’ response is flip flop, floundering and failure to act.
"Labour believes students should get additional time in school for breakfast clubs, targeted learning support and new activities for every child as part of our recovery plan.
"We believe the best way to support children’s recovery is time with friends and teachers learning new skills, not simply extended hours in the classroom.
"The Education Secretary has had ample time to look at this but is still failing to listen to calls from teachers, parents and education experts for a clear and comprehensive recovery plan. Zahawi needs to get a grip."
Ahead of the Budget, Mr Sunak told Times Radio: "Having looked through it all, it’s pretty clear the two things that make the biggest difference to children’s learning is tutoring in small groups and making sure teachers have all the development and training and support they need to be absolutely brilliant.
“We have pretty much maxed out on those things. Because there is a constraint on how much of that can be reasonably delivered.”
Paul Whiteman, general secretary of school leaders' union NAHT, said in a statement: "The gains that might be possible through extending the school day must be weighed against the costs of such a strategy, including the impact on pupils' mental health, reduced family time and less time for extracurricular activities.
"Children's happiness and wellbeing should be prioritised as well as their education."
Former children's commissioner Anne Longfield had supported longer school days as she warned one in six children may never be able to catch up on school time without the right support.
Earlier this year, the government's then education recovery commissioner, Sir Kevan Collins, said it could take years for schools to recover from the impact of the pandemic.
