"a specified length of time" is correct and usable in written English.
You can use it to refer to a particular period of time in which something must be done or is allowed to occur. For example: "The party will last for a specified length of time, from 7pm to 11pm."
Then, insist that a pitcher deliver every pitch within a specified length of time.
Independent contractors work for a specified length of time for specified pay, and the move made good business sense.
Not only do they work for a specified length of time, but they also have something that the younger people lack: experience overseeing failed institutions.
And to foster cooperation, he suggests giving lawyers a bonus if workers return to work for a specified length of time.
Reliability is defined as the probability that a device continues to perform its intended function under given operating conditions and environments for a specified length of time.
If A sold and merely delivered a slave to B, under the jus civile, A remained the owner of the slave until a specified length of time had elapsed.
The majority of U.S. states limit this conditional reversion to a specified length of a time, usually not longer than 50 years.
First, there is the question whether it is a useful goal for AI research to aim to make a machine that can pass the given test (administered over the specified length of time, at the specified degree of success).
Second, there is the question of the appropriate conclusion to draw about the mental capacities of a machine that does manage to pass the test (administered over the specified length of time, at the specified degree of success).
Cells were starved by incubating in Hank's balanced salt solution (HBSS; Invitrogen, 14025-076) for the specified length of time.
Cells were serum starved for 1 h and then stimulated with human EGF in the presence of 108 (anti-EGFR) gold for the specified length of time.
