Apple - 2 m USB Type C-to-Lightning Charging Cable - White

TL:DR - No, they don't. Only buy Apple USB-C cables at the moment. Apple does not make longer USB-C cables at this time. 2m (6.6 ft) is the longest you can buy. Do not buy off label brands as these DO NOT FAST CHARGE. Apple will likely license the MFi license to aftermarket companies after they've had a few years of profits on these.

6.5 feet = 2meter

Yes. This will work on your 7th gen iPad. It is not, however, a charger. It is a charging cord. If you need to plug it into USB, this is what you need. If you need to plug it into a wall socket, please see below.

Yes it is compatible but you must have the associated USB C wall adapter or USB C charging port on a computer

They do sell a 6FT cable, it’s the 2m version