The extra daylight starts off very slowly - the daylight length on December 22nd is only 8 seconds longer than it was on the 21st, but you can see in the "Daylength/Diff." column below how fast it ramps up. The maximum daily changes happen in mid-March when it peaks at 5 minutes, 38 seconds longer per day. The daylight length will peak on June 20, 2026, when it will be 19 hours, 9 minutes and 14 seconds long. From June 15-27 there is officially no night, only twilight.

    This graph is from timeanddate.com. See Winter Solstice in Whitehorse at 38 below for a blog post with 17 photos shot on Winter Solstice and the following day.