This actually is better than the 20% dev time in Google and other places. 20% dev time sprinkled now and then won't help to develop an idea fully since there a

This actually is better than the 20% dev time in Google and other places. 20% dev time sprinkled now and then won't help to develop an idea fully since there are still daily tasks that distract the pursuit. Development of an idea requires a long stretch of concentrated effort. 4 weeks off to experiment sounds right.