I've always felt that interviewing is a pretty high intensity activity. At least the ones I've been in, which are a parade 5-6 of interviewers asking you to do problems at a whiteboard in hour intervals. At the end of those days, I'm physically and mentally exhausted, and often hungry, as they tend to make me talk right through lunch. I really dread interviews like this.
By low intensity background activity I didn't mean that interviews are easy. I meant to suggest, interview at one company every quarter (or a similar rate).
(Though interviewing does get easier with practice. I usually batch up a lot of applications to different companies when I'm about to seriously look for a new job, and when I'm properly in gear, I breeze through those full day ordeals without too much loss of sanity. After all, there are only so many different technical interviews questions in common use amongst the companies.)
