Star Trek Picard: Every Easter Egg & Hidden Reference From 'Et In Arcadia Ego, Part 1'
16. Start Your Calculations
The La Sirena is barreling through a particularly colorful transwarp corridor on its way to Soji's homeworld. The first time we saw the inside of a transwarp corridor (or conduit) was in Star Trek: Voyager where the effect was mostly bluish-gray and nearly identical to quantum slipstream drive as seen in the episode "Hope and Fear".
According to the La Sirena's computer, the chroniton field is holding. In the previous episode Rios chastised Soji for not thinking to project a chroniton field before taking the La Sirena into the transwarp corridor because (as established in the Voyager episode "Shattered") the chroniton field is a necessary component for transwarp travel.
As the Sirena arrives at the planet Soji recognizes as Coppelius, Picard tells Agnes they just traveled 25 light years in 15 minutes. According to the handy online Warp Speed Calculator, that's warp factor 10, or about 876,600 times the speed of light.