I guess you mean to Baldy Notch, if you hike there from Icehouse Canyon Trail, it's about 9 miles just one way, one of the shortest way is from Monk Flat Campingroun via San Antonio Waterfalls Trail, it's about 3 miles one way, it's a dirt trail, no shade at all, not a good trail. I highly recommend you take a hike to Icehouse Saddle from Icehouse Canyon Trail.
If you are thinking about the Baldy Notch, it should only take 1hr or 1.5hr to hike it up.
Thanks! Your answer is awaiting moderation.