Is there a theoretical (or practical) limit to the number of rows you can have in a Matrix field?
Let's say each row has 5 single line text fields and a date field.
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Sign up to join this communityI would say with that kind of data, the practical limit would be pretty high, since each row would have very little data (compared to, say, a Playa field in one or more columns).
Said practical limit would be based on a combination of your server memory (for selecting and iterating all the row data, then all the regex used in parsing each row in your template), and browser memory (due to the required javascript in the CP).
Looking at the Matrix fieldtype: