The phrase "a variable length of time" is correct and usable in written English.
It can be used when referring to a duration that can change or is not fixed.
Example: "The project will take a variable length of time to complete, depending on the resources available."
Alternatives: "an indeterminate duration" or "a flexible time frame".
Thalidomide is often used initially to treat multiple myeloma and can prevent progression for a variable length of time.
It is useful to know because if so, you can expect to feel off colour for a variable length of time - anything from one to several weeks, which may be important if you have exams looming.
After a variable length of time, however, the systems relax, and the detergent character of the humic polymers returns to the original level.
As many as 30 sleeping sites may be used over the course of a year, each for a variable length of time.
The future convert then demands a sign of God's reality, requires a variable length of time to strength his faith and experience the Holy Spirit, then engages fully in the church.
Second, a white target square was presented for a variable length of time (180 280 msec) and replaced by a crosshair for 1720 5820 msec.
Baseline and outcome variables were descriptively analyzed and per-patient-per-month (PPPM) costs were used to account for variable length of time observation.
All brains were fixed and stored by immersion in a 4% aqueous solution of formaldehyde for variable lengths of time beginning at the time of brain removal from the skull.
"But the half-million members of the majority's approved class held a multitude of jobs, at different levels of Wal-Mart's hierarchy, for variable lengths of time, in 3,400 stores, sprinkled across 50 states, with a kaleidoscope of supervisors (male and female)." "They have little in common but their sex and this lawsuit," Judge Kozinski concluded.
PTSD in particular is a complex affliction that is underreported and may also take variable lengths of time to develop, which may cloud possible associations with divorce.
Nevertheless, doctors should not prescribe it or even advise its use, because it is hard to be certain of the correct dose, there's no standardised preparation and its effects can last variable lengths of time.
