First of all, Nuria, it sounds like you are doing a great job especially since English isn't your first language! I am impressed!!
Our experience with LR didn't start until my LO was 23 months old. Right from the start, we used it five days a week, showing a session in the morning and a session in the afternoon. Some weeks were just busy and we didn't always have the time. My opinion is, try to do it five days a week, and if not, just be as consistent as you can be. These little ones are pretty flexible thankfully, so they overcome most of our shortcomings!!
We didn't use the LR book set until after she was 23 months. She definitely has enjoyed them ever since we got them. We don't read them as often now that she is 3 years old, but she still will occasionally choose one of those books to just sit and read. When she was 10 months old, I did read other books to her.
We didn't use any other programs since LR was all we had. Eventually, we did start using Starfall to learn the phonetic sounds and then Reading Bear once she knew all of her basic phonics. I think especially with the newest version of LR, kids can get most of their phonics just from using LR. But since Starfall and Reading Bear are free...we used them too! Phonics are a great way to learn reading, but I know with my daughter, she learned a lot of her phonics just by default. I guess she just intuited them.
As far as when you can expect to see the results... that would depend on your child's personality. My daughter likes putting on a show for anyone and everyone!! But she is also stubborn and can act like she doesn't know even the most simple words now that she has proven otherwise so many times. Just keep having fun! EL is a great journey! And definitely keep us posted!