Record Keepers of the Book of Mormon

Gen	Name	Relation to previous	Year started	Year ended
1	Nephi son of Lehi	--	600 BC	545 BC
1	Jacob	brother	544 BC	(421 BC)
2	Enos	son	(543 BC)	420 BC
3	Jarom	son	419 BC	361 BC
4	Omni	son	360 BC	318 BC
5	Ammaron	son	317 BC	280 BC
5	Chemish	brother	279 BC	(130 BC)
6	Abinadom	son	(279 BC)	(130 BC)
7	Amaleki	son	(279 BC)	130 BC
8	King Benjamin	no known relation	129 BC	124 BC
9	King Mosiah	son	124 BC	91 BC
--	Record of Zeniff	**	200 BC	120 BC
10	Alma the Younger	no known relation (1)	91 BC	74 BC
11	Helaman	son	74 BC	56 BC
11	Shiblon	brother	56 BC	52 BC
12	Helaman	nephew	52 BC	39 BC
13	Nephi	son	56 BC	1 BC
14	Nephi	son	1 AD	34 AD
15	Nephi	son	35 AD	(193 AD)
16	Amos	son	(35 AD)	(193 AD)
17	Amos	son	194 AD	(320 AD)
17	Ammaron	brother	(194 AD)	*321 AD
18	Mormon	no known relation (1)	335 AD	*385 AD
19	Moroni	son	400 AD	421 AD

(1) However, Alma and Mormon were both descendants of Nephi
1021 years over 19 generations means about 54 years per generation on average.