in length of gen.

[finance]

If at any time there is more than one Co-Chairman the right in the absence of the
Chairman to preside at a meeting of the Directors or of the Company shall be
determined as between the Co-Chairmen present (if more than one) by seniority in
length of appointment or otherwise as resolved by the Directors.

как тут понять - in length of appointment

в течение срока его назначения или с момента его назначения?

[алешаBG]

by seniority ≈ по старшинству
т.е. с момента его назначения до сих пор))

[s_khrytch]

м.б. лучше: по длительности пребывания

[10-4]

by seniority in length of appointment - по продолжительности срока с момента назначения на должность