Non-performing Assets (NPAs) of a bank in India is defined as an asset, which remains unpaid by a borrower for a certain period of time in terms interest, principal, or both. Reserve Bank of India (RBI) has changed the definition of NPA thrice during $1993-2004$, in terms of the holding period of loans. The holding period was reduced by one quarter each time. In $1993$, the holding period was four quarters($360$ days).

Based on the above paragraph, the holding period of loans in $2004$ after the third revision was________days.

1. $45$
2. $90$
3. $135$
4. $180$

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