Ali Reviews can help you to import more than 1500 reviews for each product.
The quantity of the reviews depends on your needs. However, the number and size of images attached to the reviews may slow down your web speed if you get too many reviews for each product.
Hence we highly recommend you to add from 100-200 reviews for a product to speed up site load, and avoid overwhelming customer with reviews.
If you need some more helps, please feel free to contact us via live chat or email us at firstname.lastname@example.org