what is the maximum limit of records we can have in price adjustment matrix

We have a requirement to have pricing at item category level and since out of box functionality do not support this. So to meet the requirement we have performed below steps:

1. Create item UDA to copy the item category
2. Define matrix adjustment in "Price List Charge Adjustment" to pull the item UDA
3. Set up zero price list at item UOM level
4. Add Price Adjustment Matrix with item category and add record of all item category and corresponding Price Override value

We wanted to understand what is the limit of maximum records we can have in Price Adjustment? We are asking this because business wanted to keep history of price change in their system for future reference.