I think the "less emails" is not nearly as important as making it as easy as possible for them to respond to you. The more work they have to do, the more likely they are to just ignore the email rather than reply. That's why I would either not say anything or just suggest general times (e.g. "Afternoons on Mondays and Tuesdays are best for me.")
The beauty of asking for multiple specific times is that the asker can then respond affirmatively to one of those specific times (likely to the respondent's first choice), and eliminate any additional email exchanges.
