"duration will" is a correct and usable phrase in written English.
You can use it when referring to the length of time that something lasts. For example, "The duration will be two hours."
The duration will be at least 14 days.
Hard bargaining over price and duration will be essential.
Rather, its duration will be directly linked to the jobs picture.
The shorter orbital duration will give scientists more opportunities -- 44 are planned -- to make close approaches to Titan.
Even the media, which left its collective brain in volleyball sand for the duration, will revert to type.
"The period of transition" and its "form and duration will be determined later," said the declaration, which was drafted and signed after senior officers met with the joint chief of staff on Saturday.
It released €10m in humanitarian aid but failed to explain that the amount it will be paying Morocco over the four years of the fisheries accord's duration will exceed €144m.
Mean follow-up duration will be 4 years.
The mission duration will be one Martian year.
Unless phrases are merged, phrase duration will therefore also decrease.
Nevertheless, decreasing this duration will lead to an unmet load.
