That leads to doing nothing but mucking about on the Internet, not actually furthering anything for yourself. So it can have an impact on you mentally. I've felt that myself before.
Now, some people have a well-defined work output where the boss just says "I want this, that's all". So if you do it in 3 hours in one day or 40 hours in one week, it doesn't matter, meaning you can actually use those other hours for yourself.
I mentioned in another comment how working remotely has been a big productivity boost for those non-working work hours. Similar to tayo42 in another reply, it provides me the opportunity to do a lot of things that I previously did outside of work hours. One example is that I used to wake up an hour earlier to get exercise in before work. Now I sleep in and get that exercise in during the work day.
> The American complimented the Mexican on the quality of his fish and asked how long it took to catch them.
> I don't catch them. I just go to one of the other fisherman's boats from my company and take a few of their tuna. That way they get up at 5am and work there asses off and all I have to do is carry a couple of their tuna in to earn a living.
Note: I didn't say he stole the tuna. All the tuna needs to be carried in. He just didn't do as much work as the others. He did the minimal work, "carrying in a few tuna", instead of the full work, "spending hours catching tuna and also carrying them all in".
The OP isn't running their own business. If they were sure, they could decide to only work enough to pay the bills and enjoy the extra time. Instead the OP is at a company. If they're not doing the work then others are probably picking up the slack and the OP's possibly effectively riding off their work. I get that's harder to account the larger the company but it becomes very clear on small team or small company.
I don't take fish off other people's boats. I tell people I was fishing for 8 hours when I was really fishing for 2 and maybe blame the weather for why I didn't catch more.