The phrase "a maximum of approximately" is correct and usable in written English.
It can be used when specifying an upper limit that is not exact but is close to a certain value.
Example: "The project will require a maximum of approximately 50 hours to complete."
Alternatives: "up to about" or "no more than roughly".
In self-nucleation experiments, supernucleation effects were obtained up to a maximum of approximately 200% efficiency.
The force of the instrument may be varied by the operator to a maximum of approximately 221 N.
Porosity varied from a maximum of approximately 65% at the surface to the region of 30% internally.
Also comparable was daily g/kg ethanol intake, which increased for both groups with the availability of higher concentrations of ethanol in the sipper CS, up to a maximum of approximately 0.8 g/kg ethanol intake of 10% ethanol.
IPv4 allows for a maximum of approximately 4.3 billion devices.
Kinetic studies indicate that both fibrinogen and heparin increase the second-order inhibition constant by a maximum of approximately 4-fold, whereas vitronectin increases the rate constant by a maximum of approximately 6-fold.
RESULTS: Contrast enhancement with Isovue-370 increased over time with a maximum of approximately 500 HU (aorta) and 900 HU (kidney cortex).
Slip on the secondary fault is dominated by the reverse component with a maximum of approximately 2 3 m.
The results indicate that the pressures may be underestimated by a maximum of approximately 80 bar for the mixture considered.
The distance from the trench axis to the deformation front is to a maximum of approximately 4 km.
One of the inherent problems with Second Life today is the limitations on attendance; an entire island or sim (Second Life for server) can only handle a maximum of approximately 78 users at one time.
