The phrase "a span in which" is correct and usable in written English.
It can be used to describe a specific duration or period during which something occurs or is applicable.
Example: "The project will take place over a span in which we will conduct several experiments and gather data."
Alternatives: "a period during which" or "a timeframe in which".
Schulman (17-4) got into trouble over the course of the first three innings, a span in which South Torrance scored all seven of its runs.
She fears that this is too short a span in which to show striking change.
Lamoriello has been running the Devils since 1987, a span in which the team — my team — has missed the playoffs only three times, and won three Stanley Cups.
He also extended his streak to four-straight games with 100 yards or more rushing, a span in which he's combined for 620 yards on the ground.
The Wildcats held Oregon scoreless over the first five and a half minutes, a span in which the Ducks committed seven turnovers and six fouls.
When World War II ended, Hirsch turned to professional football with the Rockets, playing for them from 1946 to 1948, a span in which their record was 7-32-3 under seven coaches.
After a three-and-a-half-year span in which only one online retailer, Overstock.com, went public, RedEnvelope, the online and catalog gifts retailer, raised roughly $31 million in its initial public offering of shares late last month.
Gaines scored 8 points in a 2 44 span in which the the Cardinals closed to 70-69 with 1 55 left.
St . Johns made 12 of 14 free throws during a 6:46 span in which it produced only three field goals.
The increase in oxygen isotopic values occurred over a time span in which the catchment area of the basin experienced significant uplift, causing the δ18O value of precipitation to become more negative.
The Trump-centric dinner capped what could only be described as the Week of the Donald — a dizzying span in which the developer and reality television star drove the news (compelling the president to release his full birth certificate) and became the news (after delivering a profanity-laced speech in Las Vegas).
