The McMillan options book had a graph of the point where option decay really accelerated. I think it was with about 3 weeks till expiration. Can anybody post this graph, or give the McMillan page number? Thanks, W
Not exactly what you are looking for, but I'm sure it's pretty much the same graph as this one. As you can see the slope really steepens with about 3 weeks to expiry.
It boils down to what is the strategy you want to employ...some prefer to take advantage of shorting the short-term options but at the same time long with the same month, for instance Iron condor...but in such a way that it gives you theta edge... Profitable trading, OptionPundit www.OptionPundit.net