7 Lds, that's not bad at all! Keep up the good work!

Don't forget that lucid dreaming is a skill like any other and the more you train (i.e. more lds you have), the better you will become at things like induction, dream control and ld lenght. So keep it up! Do you do wbtbs? Try to pick up a day (possibly during the weekend if that's a quiet time with sleep opportunities) and experiment with the lenght of wbtbs - say from the 5 to 30 mins range and note if that makes any differences for lucidity and dream lenght. Also, don't forget to be as involved as possible in the dream - going for tasks is actually best (as it keeps you focused on the dream environment and items).