How many regions styles can you have in one table in MapInfo Professional?

In a normal .tab file, you can have up to 250 regions styles. 

However if you try to go over this limit and then try to save the table, the region will revert back to it previous style.

To counter this limitation, please make use of the new Extended tab file in MapInfo Pro 15.2. This allows for more than 250 region styles.
UPDATED:  December 6, 2019