It is not required to be YR or SR here to be a Shriner.
We recently had a Brother get his FC on a Thursday and his MM on a Saturday. We had written permission from the GL to do this. The Brother was suffering from cancer and he was given a few months to live. I see no problem with that.
I personally feel there is a lot of information to be taken in, and that information is the foundation, for one day classes. Our SR Valley does the SR classes over two Saturdays. We did about 14 degrees during those two. And it is a lot to take in. I doubt I can remember 25% of the degree's. I'm told this is different from the "old" days when there was a degree per meeting.
The YR does theirs over a Fri/Sat from my understanding. Friday is 1/3, Saturday morning is another 1/3 and Saturday afternoon is the last 1/3. Again, this differs as I was told it was done in the "old" days.
Sort of like you read in the really old days, you may wait years between degrees in the BL.
Can a 1 day Mason be as good as a "traditional" Mason? Sure, they can. I learned more from watching the degree's over and over, then when I went through. I was so nervous and hoping I do make a fool out of myself, that it was hard to understand what was going on. We will always have those that are active, those that join and find it is not for them and drop out, those that join and are inactive in BL but active in other areas. Each person goes through for their own reasons, no matter if I like those reasons or not.
All that being said, and trying to be the "devils advocate". My personal opinion. I tell someone interested to stay away from it. The experience you go through cannot be replaced. It is a once in a life time sort of thing. I'm wishing for my MM they would have done the long version for me instead of the short. I've now learned to parts in the long form, and have watched in many of times. But I will still not have that experience of being a candidate for it.
In FL our GL has said no to one day classes. The next one may change it. Permission can always be given for extreme circumstances. If someone is a good Mason though, I will not bar any one day Masons from the Lodge, like I have heard some members saying. But then again, I hope to visit a P.H. Lodge in my lifetime. But that is a whole other can of worms.