From the Smiths statement -
. They left that establishment around 21H55...he was heading toward his apartment (Estrela da Luz complex) which is located a little above the street that crosses the primary school. As he reached this artery, he crossed an individual holding a child. He notes that it is normal to see people carrying children, especially during the holiday season. This individual was walking the downward path, in the opposite direction. He is not aware where this person was headed. He only saw him as they passed each other. He assumed it was a father and daughter and thought nothing more of it.
Urged, states that when he passed this individual, it must have been around 22H00.
http://www.mccannfiles.com/id162.html
Here's my line of thought -
Kate went and did her "check" at 9.55.
The alarm was sounded at 10.
The Smiths saw the "perp" at "around" 10,
5 minutes walk away.
The perp is alleged to have exited the window.
The perp gets out of the window (Tapas side) with Madeleine at what time?
By necessity, it has to be pretty much right on 9.55.
Kate would have seen him leaving.