спеціальна аварійно-відновлювальна машина на шасі автомобіля ISUZU NPR75L-K або еквівалент

You are absolutely wrong. Law 922 says "15-30 days". KMU 1178/34 is ALLOWANCE only, not a LAW. Nobody said "maximum 7 days". It is said "not less than 7 days". In principle - it is up to you. We are overloaded by other orders from your colleagues from other regions. When this tender fail - reissue it with reasonable terms.