A most unscientific summary! Thank you to all who participated (19 respondents).
Average time to PSP/CBD Dx: 3.7 years
Shortest wait time: 4 days (!)
Longest wait time: 7 years (3 respondents where PD was first diagnosed and lived with for years.)
Most respondents waited: 3 or close to 3 years (6 respondents)
2 respondents were dx in under 1 year
As best I can tell, the country of origin did not make a difference overall in the time to dx for the group of 19 who responded.
UPDATE July 13/18: 20 more responded. Lots more "long period" respondents who spent years under PD dx (and 2 who spent years in ophthalmologic testing & dx). If I INCLUDE those described above the average time from symptom to dx is 5.4 yrs. If I REMOVE the PD & Ophthalmologic dx respondents, the average is again - amazingly! - 3.7 years.