Are you talking about the Omega branded mesh? I have three of them (20, 22, 24 mm) and they fit well on my 7.25 wrist. I have them on the furthest pin, so if I had to go larger I would need to buy one of the mesh extensions they offer.
I know it might be hard to see the length in the pic due to the angle, but the measurement is 6 1/4 inches. This is with it adjusted on the furthers pin.
If you are asking about the off brand mesh, I can tell you I bought a low cost mesh for my Longines Legend (since sold) and had to use the dremel to cut it down to make it work. This was a pain.
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