Aside from the limits of your chosen plan, there are no limits to the number of locations you can import. If the limit of of the account is reached there is a soft warning that shows what the overage is and how to resolve it. If the limit is reached multiple times it may be time to think of an upgrade!
| Essential | Growth | Scale | Enterprise |
Locations | 100 | 10,000 | 100,000 | Unlimited |
To see more plan comparisons check out this page.