It takes an hour from the time I start nursing my 6 mos. old to get him to sleep at night. He sometimes falls asleep on the breast, sometimes not, but he's always awake when I put him down. He rolls around for a good 40 minutes or so, rolling over etc. then I have to go flip him. This is even on the nights where he shouldn't have been overtired. Bedtime is 7:30PM if last nap of day ended anywhere after 5PM and 8PM if there's an opportunity to get him down for suppertime nap.
Because i nurse him in a quiet dark room , shouldn't this be sufficient windown? I find its the same after his early morning feed around 5AM. Still takes another 30-40min. for him to go back to sleep after he's finished eating and there's no stimluation going on at that hour.