score:4
If everybody is careful, a C visa could be granted until the day before your D visa starts. At midnight, you stop staying on the C visa and start staying on the D visa.
Upvote:4
Just thought I'd follow up with an update as an answer.
So I finally have settled all the visa stuff. There is an overlap for my case.
I applied for a Schengen 'C' Visa double entry for an 8 days trip - and was given a multiple entry, 6 month validity visa. I asked the consular officers at the embassy if the overlap was an issue & they said it's not seeing that they are 2 different visa types (though the 'D' Visa has been given parity of movement in Schengen).
Anyway yep hope it helps others who might have the same query!