The phrase "a range of six weeks" is correct and usable in written English.
It can be used when referring to a specific duration or time frame that spans six weeks.
Example: "The project is expected to take a range of six weeks to complete, depending on the resources available."
Alternatives: "a period of six weeks" or "a span of six weeks".
As proposed by Edward Lorenz in 1963, long range forecasts, those made at a range of two weeks or more, are impossible to definitively predict the state of the atmosphere, owing to the chaotic nature of the fluid dynamics equations involved.
Reportedly, the Ballard examination has been found to confirm gestational age within a range of two weeks even for premature infants [ 21, 26, 27].
They average around three weeks in length with a range of two to six weeks depending on the topic.
Factfile Caroline Hendrie sampled a range of four independent week-long walking holidays in the Catalan Pyrenees from Inntravel (01653 62901653
At the onset of the crisis many hoped BP would be able to stop the leak in the range of two weeks, but with those hopes dashed, Wall Street is looking to the completion of the relief well as the best bet, but the time horizon for that solution is August at best.
A mid-range ban of six weeks would leave Hartley without any rugby up to 21 January, when England go into their Six Nations camp.
It was a mid-range offence of six weeks, but we have reduced the sanction by two weeks based on the player's good record and conduct at the hearing".
Onset of thrombocytopenia was delayed by a median of six weeks (range 2 to 18 weeks), and thrombocytopenia nadirs by a median of ten weeks (range 5 to 19 weeks), relative to the start of PR-104 treatment.
Three of these received oral antimicrobial therapy for a median duration eight weeks (range 4 8) and three received parenteral antimicrobial therapy for a median duration of six weeks (range 4 6).
