The phrase "additional one hour" is correct and usable in written English.
It can be used when referring to an extra hour added to a time frame or schedule.
Example: "We will need an additional one hour to complete the project due to unforeseen circumstances."
Alternatives: "extra hour" or "one more hour".
The intervention group will receive the same amount of intervention as the control group Monday to Friday, plus a full service on Saturday, equating to an additional one hour of physiotherapy and one hour of occupational therapy.
Once a month, there will be an additional one hour medical evaluation.
The intervention group of fathers attended the routine antenatal classes with an additional one hour session incorporated into the hospital program.
Cells were given a 1 h treatment with the platinum complex under oxygenated or hypoxic conditions and then an additional one hour of exposure to the combination.
After incubation, the membrane was washed three times, and peroxidase-conjugated goat anti-rabbit or goat anti-mouse secondary antibodies (ICN Laboratories; diluted 1 10000) were added and incubated for an additional one hour.
The ST samples were washed with PBS, and a 1 200 dilution in blocking buffer of fluorescent conjugated donkey anti-mouse and donkey anti-rabbit antibody was added and incubated for an additional one hour at 37°C.
Current applications discussed in an additional one-hour tutorial each week.
After the show aired the fall of 2012, HGTV extended the series to include three additional one-hour episodes that followed her to her new home, "Beyond Spelling Manor" which aired in 2013.
The Bush administration has said that it wants 11,000 more volunteers working an additional one million hours by 2011, and the National Park Service recently hired 25 volunteer coordinators nationwide.
Their production is accompanied by an original score, and each performance comes with free pre-curtain play activities and a reading area with children's books; the additional activities begin one hour before the performance.
After an additional incubation for one hour at 37°C, the plates were washed and 100 μl of the tetramethylbenzidine/H2O2 substrate solution (Kirkegard and Perry Labs, Gaithersburg, MD, USA) was added.
