Bid validity. 4.6.1 Prices and other terms offered by Xxxxxxx must be firm for an acceptance period of 180 days from last date for submission of bids as mentioned in ‘Critical information’ sheet. 4.6.2 In exceptional circumstances the Bank may solicit the Bidders consent to an extension of the period of validity. The request and response thereto shall be made in writing. 4.6.3 Bank, however, reserves the right to call for fresh quotes at any time during the period, if considered necessary. 4.7