For how many days did R possibly stay in India ?

Here,

S>R and T>S thus T>S>R.

P>U as P has stayed for more number of days than only U, which makes P second last and U last in terms of number of days spent.

Now,

T>S>R>P>U which leaves us with Q, which leads to :-

Q>T>S>R>P>U. (T has not spent the most number of days)

The person who has spent second most days, i.e. T has spent 47 days.
S has spent 15 days less than T, i.e. 32.

Now, the person who has spent second least days, i.e. P has spent 15 days.

Thus R has spent less than 32 days and more than 15 days :-
32>R>15
The only option satisfying this is (D).