I'm currently trying to apply to as many grad schools as I can (France) and all of them require one or more reference letters.
The past few months I feel like I have already bothered me enough with this matter. But unfortunately, some schools requires that the professor sends it personally, instead of having me acting as a middle man.
If I could just get them to write once and send that copy everywhere I would do it but in the current circumstances I cant. And I feel bad for asking more reference letters when their workload is already heavy.
Fortunately, the next deadline is 1 month away.