The MTA is extending the period of one-way and round-trip tickets on the Long Island Rail Road and Metro-North from two weeks to two months.

The agency also is extending the refund period on those tickets from one month to two months.

Ten-trip tickets will continue to be valid for six months.

A $10 refund processing fee will remain in effect to cover administrative costs.

The MTA says the changes will cost the commuter railroads a total of $6 million but reflected the agency’s commitment to customer service.

It had decreased the validity periods in December 2010 to reduce revenue loss from uncollected tickets.

The revised policy announced Monday was made in response to complaints from customers and elected officials.