I have recently contacted a professor for an advertised phd position and we had a meeting to discuss the details. After this meeting, which went reasonably well, he asked me to send two referral contacts which he will directly call. Two weeks have passed since I have sent them.
I think it is not too long since it might take some time for him to call both of them (since he and also the referrals are quite busy all the time). However, I'm a bit unsure if I should send a reminder or follow-up e-mail soon to ask the status.
What is the appropriate waiting time for that?