It's not by day, but by semester. Within the US it is approximately 60 credits total in coursework, and the rest is preparing and defending the dissertation.
There are many of course. They all need many PhD's.
A person is able to transfer to another college to obtain a phd if they have attended TIFR. Many colleges will accept the courses taken here as transfer credits for their phd program.
no credits
96 credits
you need 5 credits
1600 credits
You need sixty college credits.
100 Credits.
44 credits
42 credits :)
You need 17 credits to be a Senior ask your counsler about how many more credits you need to be a senior if you are not sure.