The supply of fuel gas is limited by the following factors:
the size of the house (building, apartment) connection to the main supply
the size of the connection in your kitchen
If you have a supply currently sized for a standard oven/range combo, and you install a second range, you might not be able to run all three at the same time with sufficient supply. But running any two of them simultaneously should be just fine.
If you need a larger building connection or kitchen connection, these can be arranged at a cost in time and money.