you can certainly petition...
I know Cori's ex only gets D7 for 2 weeks time in the summer

we have primary physical custody with her mom getting 50% visitation
however
she sees her every 3rd weekend of the month and split holidays

we are going back to court this summer to push for supervised visits
she is diagnosed unmedicated bi-polar
has tested positive on all drug tests ordered by the court
has swiped D7 and refused to return her
has not held a job in over 3 years
has filed false police reports several times
refuses to bathe D& during her monthly visits
the list goes on and on

our attorney says we are in for a battle

you can certainly ask for 4 weeks...what does your lawyer say?