The sentence 'hours is needed' is correct and usable in written English.
You can use it when discussing an amount of time that is required for a certain task or activity. For example, "Six hours is needed to complete the project."
Owing to the rapidity of action a number of toxicant, a single or repeated examination over a few hours is needed to define the toxidrome and therefore the class of toxicant.
Particularly, higher segmentation reliability than we previously reported is required for amygdalae, hippocampi, thalamic, and caudate nuclei [13] and reduction in total segmentation time from several days to a few hours is needed to facilitate larger studies [22].
Also, the BPND in the striatal and its closely neighbor regions such as the ventral striatum and globus pallidus could not be quantified using 11C-FLB 457 because a long time more than a few hours is needed for reaching equilibration in the striatum [37].
When samples with low copy number are used, the full reaction time of 16 hours is needed for the reaction to run out of reagents or to reach a point where the level of non-used random primers is low enough to not interfere with the downstream real-time PCR.
50 Frequently, the incubation time for these assays is one cycle of parasite replication or 48 hours, but for doxycycline at least 72 hours and preferably 96 hours is needed, depending on the assay method, to obtain accurate results.
About 12 hours is needed for the curls to take.
Considerably more staff, being paid enhanced rates for working unsociable hours, are needed.
Two and a half to three hours were needed to complete a three-course dinner.
At least three hours are needed to take in the exhibition fully, and the time does not fly by.
Productivity measures how many worker hours are needed for a given unit of output during a given time period; when hours fall relative to output, labor productivity increases.
But a big triumph came when he convinced the board that longer library opening hours were needed during the exam period.
