The phrase "although the length of" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the length of something, typically in a comparative context.
Example: "Although the length of the report was extensive, it provided valuable insights."
Alternatives: "despite the length of" or "even though the length of".
Although the length of the breeding season varies by subspecies and geography, it generally occurs between June and December.
Blackwell's assistant manager Sam Ellis will also stay on at Bramall Lane, although the length of his deal has not been disclosed.
Every 90 minutes, a normal sleeper cycles between two major categories of sleep — although the length of time spent in one or the other changes as sleep progresses.
Although the length of the undisturbed tunnel varied widely, the tunnel was shortened or eliminated by placement of a non-self-centering device.
Although the length of time to eat a slice of pizza remained stable between viewing conditions, the amount of time before starting another slice was shorter during TVV.
Most of the Arab states subsequently followed this pattern, although the length of the school year varied from country to country.
Portland feared the worst after Nagbe left the field in a wheelchair, but it seems he got lucky, and has nothing more than an ankle sprain, although the length of his spell on the sidelines is yet to be determined.
Although the length of the first meal after feed delivery was similar between treatments, heifers on the HCR + S had a larger first meal compared to when they were provided the LCR (4.2 vs. 2.3 kg/meal).
He said he was "honoured" to extend his stay at the Stoop, although the length of his new deal has not been disclosed.
Quote Message: It's a relief to everyone concerned that a decision has finally been made, although the length of time taken to get there has been very frustrating.
Although the length of the ciphertext and decryption key is changed, the overhead is not increased significantly.
