Rulings on Pubic Hair and Hair under Armpits

Q: I would like to know detailed rulings on Pubic Hair and Hair under Armpits.

  1. Is there any time limit like 40 days? Is that Fard, Wajid or Sunnah?
  2. Is it true that one's supplication will get no answer if those hairs are not removed within 40 days?
  3. Can we use Hair Removing Cream or Lotion instead of Scissors, Razor or some other sharp things since they are risky in handling?
  4. Actual boundaries of Pubic/Under Armpit Hair to be removed?
  5. Hair around the Anus?