If your wife has been doing this for a living for a while, you know that she can't walk out of a case and call her H. Don't let your insecurity worsen the situation for you or the kids. I work in a similar job and sometimes I'm home at 7, sometimes 8, sometimes 9 and I don't always have the ability to call. My family just understands that mom gets home when mom gets home.
Would it work better if you didn't tell the kids a time?
I don't think you can force yourself to trust. Let go of that but when those doubting thoughts creep in remind yourself that you don't know what she's doing but it could very well be what she told you, working.
Only you can control your mind and where it goes.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss