They do make "pressureless" balls that arguably last a bit longer (which no one in the US uses it seems), but pressurized balls will go flat even if they're not

They do make "pressureless" balls that arguably last a bit longer (which no one in the US uses it seems), but pressurized balls will go flat even if they're not being used if they're opened. Wilson has a new plastic-free ball that uses similar tech to pressureless called the Triniti, which attempts to solve the plastic part and they last about 5 sets plus.