@ Rajiv
Sec.201(1) reads as under:
Without prejudice to the provisions of sub-section (1), if any such person, principal officer or company as is referred to in that sub-section does not deduct the whole or any part of the tax or after deducting fails to pay the tax as required by or under this Act, he or it shall be liable to pay simple interest,—
(i) ......; and
(ii) at one and one-half per cent for every month or part of a month on the amount of such tax from the date on which such tax was deducted to the date on which such tax is actually paid,
Therefore it can be seen from above that the interest is required to be paid from the date on which the tds is deducted to the date on which it was actually deposited. The wordings framed seems to be too specific and it seems that the interest is proposed to be charged for the entire period from deduction to payment.
Therefore in given case the period seems to be 3 months (1.11.2011 to 7.1.2012)