Hello,
Another point of view ...
- 607 is a date in a 365.25 days year
but 2520 who are added to - 607 are "prophetic years" of 360 days
...
https://wol.jw.org/en/wol/d/r1/lp-e/1101981014?q=2520++360&p=doc
Turning to chapter 12 of Revelation, we note that verses Re 12:6 and 14 show a period of 1,260 days to be “a time and times and half a time,” or 1 + 2 + 1/2 for a total of 3 1/2 times. Therefore, “a time” would be equal to 360 days, or 12 lunar months averaging 30 days each. “Seven times” would come to 2,520 days; and the Biblical prophetic reckoning of “a day for a year, a day for a year,” indicates that these actually would work out to be a period of 2,520 calendar years. (Numbers 14:34; Ezekiel 4:6) This, therefore, is the duration of the “seven times”—the Gentile Times.
The Watchtower says to us 1km + 1 miles = 2 km ... or 1nautical mile ( 1 852 m ) + 1 geographical mile
( 1 855,3m)=2 miles :(
Just a problem of conversion ...
Best regards