Your user limit is the amount that you are able to spend on a monthly basis. It will reset on the 1st of every month.
To check what your user limit is and how much you have spent, follow these steps:
Step 1: Click on the Transactions or Your Cards tab on the left-hand menu bar of the Brex dashboard
Step 2: On the top left-hand side of either page, you will see your spend amount for that month, as well as your limit