I am 5 days post BA. My implants are hard, how long does it typically take for Natrelle 410 Anatomical implant ti soften?

This type of implant is not soft.  It is a very solid feeling implant.  Your PS should have discussed this with you.  You should discuss your unhappiness with your PS.

Thank you very much for your message. The
time to soften does depend a little bit on whether the implants were placed in
front or behind your pectoralis major muscle.
If your implants are in front we would
anticipate that the majority of the swelling would have settled by a month
following the operation and breasts should be relatively soft by that stage.
However, if the implants are behind the
muscle they can appear slightly firmer initially and they may take longer to
soften, often up to 2 to 3 months.
I hope you find this information useful and
helpful and wish the best of luck.

5 days is very early after breast augmentation.  You will likely continue to have considerable swelling for several weeks.  If you are very fit prior to surgery, which it sounds like you are, the pectoralis muscles can remain firm for several weeks.  Over time they soften and the breasts appear different through these stages.  The 410 implant does not have much "settling" to do compared to other types of implants.  Remember, however, that as your tissue changes over the top of the implant, the breasts will change in appearance and softness.  I advise that my patients avoid any underwire or push-up bras for about 3 months.

After the swelling has resolved you should feel better. If there are continued problems Please find an experienced Board Certified Plastic Surgeon and member of the Aesthetic Society using the Smart Beauty Guide. These Plastic Surgeons can guide you on all aspects of facial surgery, breast augmentation and body procedures including tummy tucks or mommy makeovers!

Thank you for your question.  Do not be alarmed so early that your breast implants feel firm.  This is very normal.  Generally speaking breast implants begin to feel softer 4-6 weeks after breast augmentation and this softness may continue to improve up to 3 months.  Please consult your plastic surgeon and express your concerns.