The word 'timespan' is correct and usable in written English.
You can use it when you need to refer to a period of time, for example in the phrase "over a short timespan".
A lot depends also on the timespan over which default probabilities are estimated: longer periods of calculation would make capital requirements less sensitive to business cycles.
In terms of relieving want, "globalisation" is the difference between South Korea and North Korea, between Malaysia and Myanmar, even (switching timespan) between Europe and Africa.
Hard-headed Israelis and Palestinians, still lurching almost hourly from incident to bloody incident horrors this week include the wounding of three women in labour, two Palestinian and one Israeli, trying to make their separate ways to hospital wonder how that timespan can somehow be abridged.
Most people take out annuities long before 75, because at that point their life expectancy falls to close to 10 years, and they would struggle to find an annuity rate that would pay out as much as their capital over that timespan.
In these parts it involves the greater range of talent over a longer timespan – the Guineas over a mile at Newmarket in May, the Derby over 12 furlongs in June and the St Leger over 14 furlongs at Doncaster in September – and the last to succeed, Nijinsky in 1970, was also the last to try.
But setting deadlines does not help and frankly we do not think a meaningful handover can take place in a short timespan.
The others were asked to write about why someone might want to open a bank account or keep a diary.For their second study, Dr McCrea and his colleagues recruited 50 students, who were offered the same sums and timespans as the first lot.
The Church also called for an end to bonuses worth more than salary, except in extraordinary cases, while long-term incentives should cover five to seven-year timespans and be paid only in shares.
What took me by surprise about the collection as I was writing it, and this goes back almost to your first question, about perspectives and timespans, was how a potential constraint — in the case of "Young Skins," setting it all in the one place — was actually liberating.
Foamed polystyrene breaks down extremely slowly, in timespans no one is sure of, and a major chemical it breaks down to is styrene, listed as a carcinogen in the 2011 toxicology report issued by the National Institutes of Health.
Ever since Darwin, we've been familiar with the stupendous timespans of the evolutionary past.
