In the old testament the word week was used to represent 7 days.
The Greek had no word for week, they used days .
Nine times in the new testament the meaning of the word Sabbath (rest with no other meaning attached ) has been changed from a non-time sensitive word rest to one that is, week, making the word rest to no effect..
As i said, the concept of a week representing seven years is not consistent; but, it is present:
When Jacob served seven years for Rachel and got Leah; Laben told him he could have Rachel too; and said "fulfill her week also.
Gen 29:27
27 Fulfil her week, and we will give thee this also for the service which thou shalt serve with me yet seven other years.
KJV
Also in Daniel chapter 9:
Dan 9:24-27
24 Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.
25 Know therefore and understand, that from the going forth of the commandment to restore and to build Jerusalem unto the Messiah the Prince shall be seven weeks, and threescore and two weeks: the street shall be built again, and the wall, even in troublous times.
26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
KJV
There are other examples; but, I have prooved my point.