I have added tasks with dates but they seem to take a VERY long time to get into my calendar.
unfortunately, the frequency in which the calendar software gets updated depends only on the program itself and the Google Calendar updates added iCal feeds at least once every 24 hours.
Using different calendar software which will read the iCal feed every time you access it will fix this issue.
We're sorry for the inconvenience and we also hope that Google changes this option and allows more frequent updates in their software.
Thanks for the quick response!