Table:
text: List of members of the United States Congress by longevity of service
House time
House time
Total_tenure_rank Uninterrupted_rank Name_ Total_tenure_time Uninterrupted_time
1 1 John Dingell 58years, 50days 58years, 50days
2 2 Jamie L. Whitten 53 years, 60 days 53 years, 60 days
3 3 Carl Vinson 50 years, 61 days 50 years, 61 days
4 4 Emanuel Celler 49 years, 305 days 49 years, 305 days
5 5 John Conyers 49years, 29days 49years, 29days
6 6 Sam Rayburn 48 years, 257 days 48 years, 257 days
7 999 Sidney R. Yates (I) 48 years, 0 days n/a
8 7 Wright Patman 47 years, 3 days 47 years, 3 days
9 999 Joseph Gurney Cannon (I) 46 years, 0 days n/a

Question: How many consecutive ranks does John Dingell H hold on the list of members of the United States Congress by seniority?