Can I change the time and frequency for my daily quotes notifications?

Yes, you can always choose how many alerts you want in a day and what time of the day you want them. Go to the app Settings and tap on 'Frequency of alerts' option. Next you can choose the time span and number of alerts for that time span. Now you will get the alerts for this chosen time only and this time will be divided by the number of alerts you want so that you get these alerts after regular time intervals.