If I am correct, Lalitha Sahasranamam has in all three parts. The first one is known as Poorva bhaga, which talks about
its origin, while the middle portion refers to "stotra" consisting of 1000 Namas and the last and the penultimate
part is known as Uttara bhaga. The final part explains the details of benefits of recitation of Lalitha sahasranamam.
As a query has been raised, I heard about Lagu. Generally, the recitation of Sahasranamam blesses the devotee
with disease free life, no akala maranam, etc. Even for getting child, it can be chanted. If one goes through the
Bashyam, one can find the details in depth. As regards the timing of recitation, it could be noted in the
Uttara Bhaga. If a person chants this once, one gets the benefit of eliminating all the sins that he/she has done.
Everyone should recite at least once in one's life time. Goddess Lalithambal blesses a person who recites
this on his/her birth days and also on the birth day of his family members. It should be chanted after learning
it from a Guru without any accent mistake preferably on a full moon day besides on Fridays or during
Vasantha Navarathri or Navarathri period.