Matilda went to this routine around 6 months, and while I didn't clock watch I knew to look for tired signs around 9am and again around 3-4 hours after she woke up. It happened gradually where her late arvo sleep would get shorter & shorter & eventually dissappeared, and then she went into this pattern. It took around a month to figure it out & once done it was great. But it does take around a month for Matilda to figure out how to get to sleep again anyway