In-House Lawyers Happier?

I know of a lawyer who began his legal career with a prestigious law firm and decided that the billable hour system was intolerable.  The lawyer's spouse, however, didn't want him to leave his lucrative law firm job for an in-house lawyer position that would provide a lower salary.  The lawyer and his spouse then struck a deal: the spouse would keep track of and record her time in 6-minute increments for a period of seven days so that she could better understand her husband's unhappiness.

After days of accounting for all of her time and activities in 6-minute intervals, the lawyer's spouse was convinced that her husband should switch jobs and free himself from the burden of billable hours.  This lawyer has found greater satisfaction working in an in-house legal job that doesn't require billable hours.