4 days for work but 2-3 days also for work is pretty common (at least 6 weekly). The youngest who is now 6 year old struggles with any absence tbh because she is incredibly attached to me although she loves her Daddy very much. Leaving for work on a daily basis still involves tears.
I have had to harden my heart to it over time.
They are with their loving father when I'm away. He is incredibly competent. I love my job. It's very senior but part time - so I am around to do school run, activities etc two days a week plus weekend. They benefit from me having a very senior job and travel is part of it. I don't feel guilty but do watch them carefully - coming back early or co sleeping when they are clingy