Just wondering, how long dose it take for your previous/current supervisors to send their reference letters for you? My supervisors did not send their reference letters yet after one week of them getting the request for references.

I don't really know if there is a time frame but i needed references for mine and in about a week + few days i got them.

I think it depends on how busy they are but i'm sure it'll be done before the deadline.

Depends entirely on the supervisors and how lazy/busy they are. One of mine once forgot, and I had to get back to them a month later! The other one does it almost instantly, although won't send them back to me, but sends them straight on. Both of them are usually very prompt.

All lecturers etc. are busy, I followed up reference requests with a phone call and managed to get them straight away. Or you could visit them in person and get them to sort one out while you're there.