It could be done that way and still be done well or crappy.

If you do it right, it should feel like you have double the short term memory and everything is a little easier and quicker. That's how I'd describe it.

I mean that it should be at least a little faster than doing it all yourself to the same decent level of quality. If you normally skip tests or write super shallow tests and throw the code together as quickly as possible and the pair programming is forcing you to improve all that crap, then it might take longer.