Depends on how many bytes in table, and how long a row is.
A SQL page is 8K, with 8060 total bytes available for data. Each row resides on a single page (excluding special column types).
So if every row takes, say, 4100 bytes, each would take a whole page, with the rest of that page unuseable except to expand the existing row.
SQL DBA,SQL Server MVP(07, 08, 09) "It's a dog-eat-dog world, and I'm wearing Milk-Bone underwear." "Norm", on "Cheers". Also from "Cheers", from "Carla": "You need to know 3 things about Tortelli men: Tortelli men draw women like flies; Tortelli men treat women like flies; Tortelli men's brains are in their flies".