21 days to make a habit

Hayley from my bible study - tells me it takes 21 days for something to be come a habit.

Here are some habits I'd like to develop -
1. bible reading
2. waking up on time
3. exercising
4. erm...

So I'm going to start with

no.1 & 2 for the next 20 days ( since I achieved both today and let you know how I go)

Interestingly enough 2. may be interesting since I go on holidays on the 26th of october.