Was this actually rock climbing or was there a circumferential trail?
The first 300 feet or so is a steep grade but there is/was a post and chain hand rail you needed to grab to keep from falling off. After that, there was a marked trail that wort of did a switchback up to the top. I didn’t time it but it probably took about 30 to 45 minutes to get to the top, less going down if you didn’t stop. I got a couple of rocks from the top of the Rock as souvenirs.