The phrase "about one hour before" is correct and usable in written English.
It can be used to indicate a time reference that is approximately one hour prior to a specific event or moment.
Example: "We should arrive at the venue about one hour before the concert starts to find good seats."
Alternatives: "approximately one hour prior" or "roughly one hour earlier".
The diatoms, dispersed in F/2 medium, were left to settle on the transducer for about one hour before starting the electrical measurements.
In the evening, about one hour before his televised address on Cambodia, the President met with his Cabi net and bipartisan Congres sional leaders.
"I'm leaving tomorrow morning for Yakutsk, eastern Siberia where obscuration will be at 57% about one hour before sunset," says Xavier Jubier from Paris, France, a member of IAU Working Group on Solar Eclipses who has developed a website of interactive eclipse maps.
About one hour before game time, Bettis was administered a painkilling injection, but he experienced leg numbness.
Frick, who had been campaigning for higher office for months, reversed course about one hour before Maryland's 9 p.m. filing deadline.
About one hour before the wedding, the first of about 700 guests started to trickle into an elaborately decorated wedding tent.
The Carter family had a battered old set that worked for about one hour a day before it conked out.
"We canceled the deal with about one hour to go before a lawsuit was going to be filed against our deal," Mr. Schmidt said in an interview on Thursday.
What's more is he wasn't released from the hospital until early Saturday morning, getting about one hour of sleep before his third round tee time.
The information was provided to the four nurses in a single group session lasting for about one hour the day before data collection.
He recommends planning your meals and snacks so that you eat about an hour and a half before each workout and about one hour after each workout.
