There is no explicit limit. A single .mdb file is limited to two
gigabytes (two billion). In practise, I know of tables in production
databases with 20,000,000 records; more commonly you'ld want to go to
a client-server system (perhaps with an Access frontend) once you hit
a couple of million.
There is no max number of records limitation. The limit is a file size of 2GB
per .mdb file. With splitting and linking of files, you can squeeze in more
records.
I've seen Access databases with over 1 million records in them and run well.
I've also seen badly designed databases with under 100K records and plenty of
open space run very, very slow.
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