The phrase "a relatively long span" is correct and usable in written English.
It can be used when discussing the duration or extent of something in comparison to other spans, indicating that it is longer than average but not excessively so.
Example: "The project timeline allows for a relatively long span of six months to ensure thorough research and development."
Alternatives: "a fairly extended period" or "a somewhat lengthy duration".
Given the relatively long span length of the CBDPS crosslinkers and the flexibility of the crosslinked side chains, we were not surprised to find multiple CBDPS Lys Lys crosslinks.
Mr. Harper's government is now in its second year, a relatively long life span for a government without a voting majority.
In many cases (e.g., salmon and eels), animals with a relatively long life span return to their place of birth in order to reproduce and eventually die.
The microelectrode provides a linear Nernstian response of high sensitivity (58 ± 0.5 mV/decade) covering the range of 1 × 10−6 1 × 10−1 mol L−1 of Ag+ ions with a fast response time (<20 s) and a relatively long life span (>3 months).
A relatively long life span in zebrafish could also help exploring therapeutic strategies that are applicable to old or very old individuals.
Thus, using the zebrafish model to study aging may not require waiting until close to the end of a relatively long life span in zebrafish.
A relatively long life span in zebrafish (3 5 years) could be viewed as a technical disadvantage for aging research, compared to such short-lived genetic animal models as C. elegans, Drosophila or even mice.
Even prostate cancer patients undergoing palliative treatment often have a relatively long life span compared to other cancer entities.
Although an example of a slow process is aging, 52 weeks of age might not be sufficiently old for a mouse to be considered aged in the physiologic sense because C57BL/6 mice have a relatively long life span among mouse strains [median survival of 27 31 months (Gower and Lamberty 1993)] and a survival rate at 18 19 months as high as 90% (Institute on Aging HP National Institutete on Aging 2008).
