At my current job I can squeeze all my daily tasks in maybe one hour (mind you, this is after 10 years of doing a very similar set of things). It becomes longer when a significant change comes or an emergency happens but after a few weeks it's all the same. I study new things and develop my competences during the spare hours but I can imagine I could earn money as well. The pay is good so I don't have motivation to take an extra job but I can totally understand people who are more ambitious or earn less.
There's a huge difference between coasting a bit and using available time to learn, do side projects, read books, even earn a bit doing some freelance non-competitive work--and working two jobs where the expectation of each is that you're working full-time. (And, in all probability violating various confidentiality etc. agreements.)
Why would they be violating confidentiality? They are not going to tell the 2nd company about their 1st company. Also not going to share trade secrets since there is no need to.
If they do it this way, they are doing it wrong.
At my current job I can squeeze all my daily tasks in maybe one hour (mind you, this is after 10 years of doing a very similar set of things). It becomes longer when a significant change comes or an emergency happens but after a few weeks it's all the same. I study new things and develop my competences during the spare hours but I can imagine I could earn money as well. The pay is good so I don't have motivation to take an extra job but I can totally understand people who are more ambitious or earn less.