Conventional wisdom holds that if you love what you do, work will never feel like work. I don't know about that: every job is bound to include responsibilities that feel monotonous or burdensome.
Nevertheless, so far so good with my new job. Often several hours pass without me checking the time. The work is challenging and worthwhile. While I've had acting jobs I loved, I've never had a job like this before: great work, great social benefit, great pay.