"in maximum" is a correct and usable phrase in written English.
It is used to describe the highest level or amount of something. For example, "The project must be completed in maximum two weeks."
Ryan Reynolds isn't the only one putting in "maximum effort" at the moment.
But the purpose of CCGs is to bring in maximum competition.
Some days may have us letting in maximum light, some days running for cover.
In "Maximum Beauty," however, the photographer's references are more secular.
Both currents exhibited a frequency-dependent increase in maximum conductance.
And those folks are in maximum security prisons right now.
He'd interviewed some of them while they were still in maximum-security prisons.
Each prison is different, and the real problem seems to be in maximum-security prisons.
Even the inmates in maximum-security joints with their own cells never really have privacy.
If Arias does escape death, there is a possibility that she could be forced to remain in maximum-security housing.
The sight of our 150 Goths sauntering to formal dining night, in 'maximum Goth gear,' stood out like a bruise.
