What I'm seeing is definitely not a 4 hr DIA. That's one of the things I like most about Apidra. It does its job & it's gone, instead of hanging around for 4 or 5 hrs.
We've been battling some afternoon & evening highs the past few weeks. I'm beginning to think the Apidra may actually be TOO fast. The Dex graph goes flat in just over 2 hrs, then we see the spike. We're experimenting with extending the lunch & dinner boluses for all foods this week. Hoping it works.