"duration less than" is correct and usable in written English.
You can use it when you are talking about a length of time. For example, "The duration less than an hour was not enough to finish the task."
Such component registered in flares with duration less than 30 min.
For instance, of the 408 turns with duration less than 1.5 s, 47% are neutral.
The prevalence of genotype 4 was significantly higher in patients with short duration (less than 10 years) of CHC.
Other 17.5% comment on the attack duration less than 1 h and 9.2% more than 3 h (Table 4).
We excluded 279 patients because of impaired consciousness or mechanical ventilation (MV) duration less than 4 days.
Each point (x, y) of this plot shows the percentage y of segments with duration less than x seconds.
For conversion of recent-onset AF of longer duration (less than 90 days), IV ibutilide may be considered a preferred agent.
Moreover, different temporal rainfall distributions were observed for rainfall events with shorter duration (less than 12 h) than those with longer duration (more than 24 h).
The response to IV MPS was early and marked in the patients with history of shorter duration (less than 4 months).
However, PESQ is sufficiently accurate to assess bursty sparse packet loss patterns and distorted speech sequences subject to loss instances with duration less than 80 ms [15].
In particular, the prevalence of migraine may be overestimated when diagnosing migraine by the questionnaire, because headache duration less than 4 h was accepted.
