It is always up to a person how often he/she want to blog and what is his/her real intention is, also depending on what they are promoting or teaching.
People blog twice a day, once a day or every other day or week even month. But always one has to remember his/her audience not to lose them waiting to long or not to overwhelm them by piling up the information.
I for myself used to blog twice a day, teaching people about health and nutrition, and that was to much information day to day bases for most of them in this busy life, then I changed it to once a day, but that to was over whelming, finally after more feed back and response from different social media I start blogging every other day, and that start working fine for me to prepare with quality content as well as my audience to digest about my suggestions and Teachings to put it in use till the next blog arrive.
So for me every other day work fine, so one has to find in what way he/she will be more fruitful or helpful to his/her audience the most.