Stretch before and after your work-out.. Stretching afterward isn't really necessary, but if you are deliberately preparing for LL, then stretching after your workout will allow you to stretch after you're warmed up (which is good because you'll be able to stretch further when you're warmed up).
I used to do gymnastics as a teen and when new people would want to give it a go, we reccomended stretching 3x a day for at least half an hour (which is nothing really). A proper full stretch routein on your legs should last an hour, but anything is better than nothing... So I would say stretch before and after your workout, (counts as one stretch) first thing in the morning when you wake up (you'll find you are the least flexible in the morning) and before you go to bed.
My routine in the last 2 weeks was to stretch in the evening for about 20-25 min. Before doing my stretching exercises, I always were stretching. 1-2 days in the week I paused. I was especially focusing on the hamstring stretches, and doing a few extra stretches from this website:
http://exercise.about.com/od/flexibilityworkouts/tp/12-Great-Stretches-for-the-Lower-Body-Maximize-Your-Flexibility.htm. f.e. touching toes, pike stretch, etc.
In total I would say about 6-7 stretching exercises.
After reading your reply I probably think that my routine is not enough.
(-> Wow, one hour stretching, three times a day. One hour seems for me like a very long time.
Should I do many sets of stretching exercises or many different stretching exercises? Could you elaborate on that a little bit ...
Referring to your detailed feedback would you also recommend doing „cold“ stretches (without warm-up.) I myself always thought that doing cold stretches are not very healthy for muscles, tendons, ligaments etc. ?
Would you have any good suggestions for a work out routine (specific stretching exercises?)
I probably have 85-90 ° on the SLR. But I would like to raise it to 120 °. Is that a realistic goal in 5 months?
All the best