[djtango]

first, there's a definitely a stamina to it - I worked in an XP team for best part of 3 years and have at other jobs done a lot of full-time pairing (sometimes months at a time).

Second, there's a chemistry element. When there's good chemistry it can be quite effortless and the chemistry can grow - as you start to develop an intuition for how the other person thinks there's less communication and mental jostling.

I've had remote pairing sessions that have felt almost as fun as online gaming.