Well, everyone's body is different, Some doctors may error on the side of caution and move their patients through the phases slower so they don't develop complications. However, to answer your question specifically, my doc had me on two weeks of liquids pre-surgery, two weeks of liquids post-surgery, soft mushies for the third week. *IF* I could handle it, I was allowed to try solids on week 4, which I was able to do. I was eating solids by week four, probably because not having anything of substance to chew was driving me crazy by that point.
I've also noticed that here the US there seems to be a focus on telling people not to drink while eating, where it doesn't seem to be that big of an issue in other countries.