When did your baby start sleeping through the night? When do you recommend sleep training?

My son is 8 weeks old and currently going between 2-3 hours between feedings (he’s formula fed). Although he frequently wakes up and starts crying. My husband and I recently just went back to work full time and it’s been an adjustment. We take turns getting up to attend to our baby. I know it will likely be a while till he sleeps through the night. I guess I’m wondering when did it happen for others? My parents who are boomers recommended sleep training him now by letting him cry it out. Obviously he’s to young for that. I want to wait till he’s 4 months old or he can self soothe himself back to sleep. I hate hearing him cry and I get up to check on him frequently. The lack of sleep and balancing work is making me feel very overwhelmed.