bill and ben
Our unexpected kestrel visitors
Various photographs, live videos and time-lapse videos of kestrel nest activity in the Vosges, France

Kestrels fledge at about four weeks (so day 28 onwards?) They explore increasing distances from the nest, but return to it to roost for another couple of weeks. Adults continue to feed the young for a month after fledging, during which time they will learn to catch their own food (RSPB)