On the current board this is very hard to say, there are some notable runs such as Janthe's 34:42 https://www.speedrun.com/the_legend_of_zelda/run/y45j7d3m

Past this time, it's kinda unrealistic that anybody will grind Blue Ring more to progress, most people ditch the Blue Ring afterwards and switch to 2 first Red Candle and then 3 first. People got faster times that are not on the board such as me, GreenMario or rooslugs but it's more like for "fun" purposes since we already got way faster times with the current WR route