Trivia: Season 4 of Enterprise is the first season of any TV show to be shot entirely on digital film.
These Are the Voyages ... - S4-E22
Trivia: Riker is viewing the crew manifests for the USS Pegasus. The second person he looks at (the woman) is called Lt. Dawn Velazquez - a member of the production team.
In a Mirror, Darkly (1) - S4-E18
Trivia: In the opening scene of this episode (S4E18), footage from the 1996 movie "Star Trek: First Contact" was ingeniously intercut with new footage to create a startling revision that is still a Star Trek fan favorite to this day. Actors James Cromwell (Zefram Cochrane) and Cully Fredricksen (the Vulcan emissary) shot the original scene for the film "First Contact" in 1995. When the TV series "Star Trek: Enterprise" recycled the movie footage 10 years later, both Cromwell and Fredricksen received a day's pay for appearing as extras in this TV episode (about $120 for a day's work in 2005), even though they never physically appeared on the "Enterprise" set.
Answer: Warp factor has always been inconsistent and hard to pinpoint, or there's too many episodes that contradict the conversion rates. Changes were made in converting warp factor into actual speed between TOS and TNG. It seems ENT reverted back to using TOS method, which is "warp factor cubed" equals how many times the speed of light they traveled. So warp 4.5 means 91.125 times the speed of light (c). Although in "Broken Bow", with the travels from Earth to Neptune and back in about six minutes means warp 4.5 is about 86*c. However, in "The Expanse" episode, warp 5 was 200*c (instead of 125). 1 ly at 91.125*c is about 4 days, but 100 ly would be 400 days.
Bishop73