4 to 5 jobs a day is easy especially if close together and you have a helper who fetches and carries.
Besides which it could be a mix of thru lounge, spot/stain removal, small velour 3ps. Sometimes it can be a bit embarrassing how quickly you can get through a job.
If all you have to do is clean without having to do any marketing or quoting you will certainly have more time available. The trouble is that at this time of the year you work late and then there is no time left in the evening to do much and by the time you knock off for Christmas you are so tired that you don't want to party and besides you often go down with illness as your body reacts to the sudden stop of adrenelin.
Ideally no more than 4 a day would be great (good money) but then you get a regular client with a rush job which you then need to squeeze in....and then a highly profitable job presents itself which also needs to be done today and then you find yourself working a 12 hour day. It's ok if it's once a week or so, but when it's every day you will inevitably get run down. But there again it's "loads of money"
Rog