Here is a distance chart for you.As it says, these are straight line distances.
Syliras to Sunberth is about 2500 miles, so about 35 days if she was walking non-stop. She might gain time if using a horse or carriage, and lose time whenever she takes a break and sleeps.
It might be a safe bet to say about 50 days, give or take. It depends on how you think your character would travel. So your character might have left Sunberth about the 60th to 70th of Fall.