My third three-film day yesterday might have passed in a bit of a blur if it were not for the blessing of Turkish director Nuri Bilge Ceylan's metaphysical police procedural Once Upon A Time In Anatolia.
In years gone by I used to react with a mild panic when I saw films in the programme with long running times. I always felt slightly intimidated, not least by the challenge they posed to the human capacity for staying awake.
But more recently, I have come to savour the slow burners - and I'm glad to see the festival now sets aside a section of the programme to highlight them. They impart a new rhythm to the sometimes rushed experience of the 17 days.
A recent case in point was Carlos Reygadas' Silent Light in 2009 - a relatively sleek 145 minutes, paced with the assurance of a master. The opening shot tracks down from a starlit sky and then the static camera reveals a Mennonite community in Mexico as the sun comes up and the animals start to make their morning noises. It must be at least five minutes long.
Perhaps it was intended to be a metaphor for the biblical story of creation - though I find it hard to make the case that the film that follows, of an illicit liaison in a deeply religious community, is a retelling of the Fall of Man. All I know is that it pulled me completely into the film's world. My heartbeat dropped, the world outside fell away, I was hooked.