a. Lead-times on 100 records research
It depends on the country - market segment, etc, but for a part-time process, I think that 100 good accuracy records every 15 days is high performance (unless you are purchasing databases)
b. Accuracy rate
Combining web site info, linkedin, google browsing for news and articles, and +/- 5 different people search directories (available for some countries), accuracy shall be round 95%
c. Means of research
News, Linkedin, several directories, google search techniques, and in some cases, if necessary, some phone calls
2. how do you make sure the person is still with the company?
100% accuracy: phone call. In some cases you can get or deduce, email address, in this case there could be an email message. Checking for email validation is not enough.
3. how do you check emails?
There should be a pretext to send an email. Email validation tools are not enough, although if you consider this a standard procedure, they are out there available and can be used for this purpose
4. how many times will you double-check bouncers as part of initial price?
I don't know how many times is this necessary to consider email validation.
5. how do you check locations where people are based?
Linkedin, company web site. Phone call is a strong tools for this.
6. how do you check phone numbers?
Calling
7. how do you ensure that irrelevant contacts are avoided
There should be a purchase decision map with usual roles in order to contact the right people