Not sure exactly what you want, but I make a little change to what @Jeff_Perkinson provided.
First, I did a Summary like this:
![peng_liu_0-1651715117670.png peng_liu_0-1651715117670.png](https://community.jmp.com/t5/image/serverpage/image-id/42246i2137E8F561ED5F63/image-size/medium?v=v2&px=400)
And I got a summary table. Then I modified column type of "Start time" to "Continuous":
![peng_liu_1-1651715419750.png peng_liu_1-1651715419750.png](https://community.jmp.com/t5/image/serverpage/image-id/42247i50634089C449066E/image-size/medium?v=v2&px=400)
Then I Graph Build N Rows vs Start time Overlaid by Same Individual, and I got this:
![peng_liu_2-1651715487964.png peng_liu_2-1651715487964.png](https://community.jmp.com/t5/image/serverpage/image-id/42248i2CABB9917BD3E24C/image-size/medium?v=v2&px=400)
Compare to what produced by the script in Jeff's data table:
![peng_liu_3-1651715529833.png peng_liu_3-1651715529833.png](https://community.jmp.com/t5/image/serverpage/image-id/42249i47AF36F8A1D87B24/image-size/medium?v=v2&px=400)
The profiles of the two graphs should be similar. You may further edit, e.g. colors, etc.