When I asked them I stressed that if they didn't have the time, I would not be offended if they said no. Everything is done online so they just have to answer some questions and write a little bit about me.
How long do I wait for them to do this?
I sent it to them three days ago and only one has started- the other two haven't even opened it yet.
If I end up needing to say something, how can I word this?
Also- I know people are busy but when I write letters of rec for my students, i usually make an effort to have a quick turnaround time.