The phrase "a duration of approximately" is correct and usable in written English.
It can be used when specifying an estimated length of time for an event or activity.
Example: "The meeting will last for a duration of approximately two hours."
Alternatives: "an estimated duration of" or "a time frame of about".
Interviews were held face-to-face with a duration of approximately fifteen minutes or by email.
The actual process data from a CCL manufacturer in Korea was collected for a duration of approximately 5 months.
A toy gun was used as the impulsive source with a duration of approximately 10 ms as shown in Figure 3.
Circadian rhythms have a duration of approximately 24 h and can be assessed through chronobiologic analysis of time series of melatonin, cortisol, and temperature.
Spikes are transients, clearly distinguishable from background activity, with pointed peak and a duration of approximately 20 70 ms, whereas sharp waves are the same as spikes, but with a duration of 70 200 ms [21].
The meteorological station located in southern Apulia (Capo Santa Maria di Leuca) registered important sea storms coming from the S-SW in October and January with the most limited fetch sector and a duration of approximately 28 hours.
Interview duration ranged from half-an-hour to above an hour, with a mean duration of approximately 40 minutes per interview.
These changes produce an insulin with a duration of action of approximately 24 h or more after subcutaneous injection, without pronounced peaks of activity [ 10].
A significant decrease in blood pressure is usually observed 5 10 min after nifedipine administration, with a peak effect at between 30 and 60 min and a duration of action of approximately 6 8 hours [ 129].
However, with a duration of volumetry of approximately 15-30 minutes per patient [ 19, 21], repeated measurements may drift to larger values (approx. +50 mL), if patients are examined in a standing position [ 24].
The insulins lispro and aspart achieve peak concentration within 90 minutes and have a duration of action of approximately three to five hours (Bode 2004), while glulisine's peak concentration is within an hour, and its duration of action is roughly two hours (Drug Guide 2005).
