A good result will be 4 lines. 3 will need an element of fortune. A good starter is to sort your vowels out first and this will take you 2 lines. In order of frequency of use they are E A I O U. Having done that you should also have eliminated or confirmed 5 consonants. Their frequency of use starts like this R T N S L H D C M so from the third line onwards I try to confirm or eliminate these in order of hierarchy if possible.
I must do a tally as I seem to get it in 4 goes more often than not. Or at least it seems that way edit: just gone back over the past few days since I found out how it works and it looks like I get it in 4 60% of the time.
I got yesterdays in 2 and todays in 6! So yeah, element of luck indeed, I put teach for my first word and it was tease. So 3 immediate greens! Is my second 2 now...