SBAS interval pair and time priod

I have one question about SBAS begining point.
Generally how many pair should be done, for example 2024/4/3 + 12, +24 and +36 days data?

I used LiCSAR and LiCSBAS, they prepare 3 pairs, +12, +24 and +36days.
But I am not sure about standard pair number.

Also time period, I understand longer is better, if consider shorter, just 6 month is enough for SABS analisys?