I personally believe that as long as they have a large enough cage where they can get their exercise and are as well fed/have lots of water as you say there is, that they are fine. Also as long as you are still grooming them as needed. Some may disagree with me but since you have a bonded pair, they won’t get as bored or lonely. I’ve read that once rabbits are bonded, they will give their owner very less attention. (I’m going to soon be working on bonding my rabbits at). Obviously when you are home try to give them attention if they want it.
It also really depends on your rabbits. Are they normally very excited or wanting attention from you? (when you were with them for a longer amount of time, obviously when you come home after a long day they may want attention). My rabbit (Severus) used to love attention from me but then it changed. She got more interested in running around. Even when I”m home with her she doesn’t seem to miss me. Although when I pick her up and lay her on me, she loves the attention and doesn’t move for a good 10 minutes or so. But that is the only time she wants to spend time with me. I even have to pick her up and lay her on me because with everything else around her she kind of forgets about me. My other rabbit that I’m fostering to adopt (soon to be bonded with Sev) isnt a people person so I rarely get more than a few minutes with him. If I was home less do I think they would miss me? No. So kind of evaluate your rabbits like I just did. Both my rabbits have at 16 srq feet each as there living space (until they are bonded then they would share 36 srq feet of space and yes my room is half rabbit space lol).
However, make sure that you evaluate how much they eat and drink. When I’m gone for a long day I take pictures of their food and water in the morning so I can compare when I get home. Just to make sure you can catch any signs of sickness. And when any of your rabbits do get sick, make sure you are able to make way more room in your schedule for them.
Just my opinion, hope I helped.
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