The apostrophic debate rumbles on. No, there is no apostophie in such as "six weeks time".
The only time the apostophie is used in English is as follows : -
Here in London there is a street in Saint James [St.James], it is called St. James's Street. The cathedral of the City of London is St. Paul's.
Another example of the use of an apostophe is as follows: -
My brothers' daughter started school for the first time today.
Commonly now a'days, we have got into the habit of using the apostophe just about everywhere: -
"Yes, it's two door's down mate". Is an example of how not to use the apostophe. It should be, "Yes, it's two doors down mate".
The English lanuage is democratic. The people choose the words they wish to use and make up new ones which become at first slang, and are then added to the O.E.D. after about ten years if they are still in common use.
In my opinion therefore, how we use the language is up to us. We can no more be dictacted to by the universities than we will be by parliament.
It's a British thing. We just don't like being bossed about. Not even when we're wrong, which is quite often the case.