"It is disappointing to have to say that at present there seems to be no hope of estimating objectively and with a useful degree of precision how long an originally homogeneous Indo-European language would have taken to develop into derivative groups or languages which diverged as much as Greek, Sanskrit and Hittite did when the earliest texts in them were composed. Some linguists seem to think that they can make intuitive judgements about the minimum time which a particular phonetic or other change in a language would have taken. But the results of intuition when applied to estimating the minimum time in which a group of cognate languages or dialects would have differentiated to an observed extent vary so much that no useful deductions can be made from them. I sympathize with archaeologists and other prehistorians who are not primarily linguists over this. Linguists are unable to provide the information which would be most useful."