The phrase "a long time span of" is correct and usable in written English.
It can be used when discussing durations or periods of time in various contexts, such as historical events, personal experiences, or scientific studies.
Example: "The research covered a long time span of over two decades, providing valuable insights into climate change."
Alternatives: "an extended period of" or "a lengthy duration of".
The charging-discharging stability is also tested for a long time span of 12 weeks.
Relative chronological proxy indicators (the differential artifact surface abrasion degree and patination, and the non-uniform stone-tool working technologies) attest, together with the specific geomorphic positions of single sites, to several stages of early human occupation, encompassing a long time span of the Middle and early Late Pleistocene.
Our data, demonstrating for the first time a reduction of the IL-4 producing cells in professional athletes over a long time span of observation, could be in agreement with the data coming from the murine studies previously cited.
Thus, this is the largest study that has used weight measurements over a long time span to investigate associations of weight change with breast cancer risk.
A further research issue is that data analysis studies generally have a long time span between collection of data, analysis of results and dissemination of findings.
These studies highlight the frequent gene exchange between cultivated rice and its wild relatives over a long time span and the importance of crop-weedy-wild introgression in the evolutionary process of cultivated rice, as well as wild rice [67].
The NGGM mission objective aims at measuring the temporal variations of the Earth gravity field over a long time span with an unprecedented level of accuracy, both in spatial and temporal resolution.
Physician recertification beyond initial certification has historically consisted of retaining large amounts of knowledge over a long time span.
The key to his handling of large musical forms is a dramatic use of tonality over a long time span.
The long time span of the database allows us to see how a word's popularity rises and falls smoothly through social diffusion, like "theretofore" from the late 19th century, "flapper" from the 1920s, "groovy" from the 1960s and "deconstruction" from the 1970s.
We regard the long time span of disability in itself as the main obstacle to a successful return to work, not the diagnosis or vocational interventions provided.
