You have to decide the frequency of your E-zine issues. Are your subscribers going to get your issues five days a week? Once a week? Once a month?
That is up to you to decide the interval (or frequency) of your E-zine issues. If you are prepared to E-mail your subscribers an E-zine issue five days a week, great. Just make sure you have the time and effort commitment to have that accomplished. If you do not have that kind of commitment, send your E-zine issues out once a week, twice a month, or maybe once a month.
However, I urge you not to go beyond the frequency of once a month as your subscribers can quickly forget your E-zine or even you for that matter!