Mod Romance Standards

So for anyone with a good memory of Mod Romances.  Are there any kind of generally accepted standards?  For example:

1. How many lovetalks should there be before a Romance Conflict?

2. How many lovetalks before consummation or Variable = 1?

3. How many lovetalks before Committed or Variable =2

4. How many lovetalks in ToB before the end?

Thanks,

Bill