FYI, Here's how I've been timing these results.

I've added these to my .bashrc:

alias wl.go='less /var/log/syslog|grep restart|cut -c11-16'
alias wl.up='less /var/log/syslog|grep renewal|cut -c11-16'

So right after booting up, I can time the event this way:

knoppix@Microknoppix:~$ wl.up; wl.go
57:17
56:27

I do the subtraction myself, of course.
Glad to have an expert show me how to program that detail