From Bleacher Report:
Williams finished his career with a .344 average, 2,654 hits, 521 home runs and 1,839 RBI. Because he missed time during two different periods of his career, I compiled the numbers for the six years before and after the time he missed from 1942-1945 and then did the same thing for the six years around his absence in 1952 and 1953.
Because Williams did play briefly during the 1952 and 1953 seasons, I did include those numbers when figuring his projected numbers for those years.
If the totals for the five seasons he missed were added to his ledger, Williams would have hit .342 with 3,452 hits, 663 home runs and 2,380 RBI. Those numbers would have lifted him from 69th to sixth in career hits; from 18th to fourth in home runs; and from 13th to first in runs batter in.
(the article was written in 2009, so his place on the all-time lists for each statistic are not all accurate but the overall point is valid)