I play on custom settings using MCCC. I like to play with longer lifespans because I really enjoy making long and intricate stories with my sims and even default long feels too short for me. I use story progression, too, and I feel like ageing off makes my world feel stagnant. I love watching my town have their own life and family and grow old and pass on. I love seeing the family trees they create, too.
Seasons: 2 weeks each
I've left pregnancy alone at 3 days.
Babies: 4 days
Toddlers: 42 days
Children: 56 days
Teen: 56 days
Young Adult: 112 days
Adult: 196 days
Elder: 112 days
I do pause ageing from time to time if I need to spend more time on a certain storyline. Babies are short because there's just not much to do with them until they age up. If they ever remake that life stage, I'll definitely add more time to it.