Hey Terry,
Skooter is a Lantus user, so I am not sure if it is different depending on the insulin, I am sure there will be more of the knowledgeable users on tomorrow, but I can tell you what I have been told:
Normally, test, feed and shoot within like 10-15 minutes....from there, when I can I try to get a +2 as depending on what that says can give you some insight into how the cycle will go....if you have a spreadsheet, basically see it as a puzzle and fill in different hours as you can on different days....I think they normally recommend a +5 to +7 as well as usually that is when the nadir happens....
Like I said, I am fairly new myself, so you can wait for someone else to confirm those times, but if you look at Skooter's spreadsheet, you will see I try to vary my testing to try and capture all the different times in the big picture....
Have a great one!