You'll have to monkey patch the MIN_FRAMES constant in the pokemonsdk\scripts\01500 Yuki\00600 Yuki__TJN.rb script.
By monkey patching I mean you must not edit it in the this file but create a new script in the your_project_folder/scripts folder with this:
module Yuki
# PSDK DayNightSystem v2
# @author Nuri Yuri
module TJN
remove_const :MIN_FRAMES
# The number of frame that makes 1 minute in Game time
MIN_FRAMES = 600
end
end