I went through the Two Sigma SWE loop earlier this year after a career gap and one thing I really struggled to find was concrete dates. So here's my timeline, as precise as I can remember.
Week 0: Applied online, got an email from a recruiter 8 days later asking to schedule a call.
Week 1: Recruiter call (30 min). Mostly fit/background, brief overview of the role, they explain the process. Very professional. I asked about timeline and was told "the full process typically takes 4-6 weeks."
Week 2-3: First technical round (online, HackerRank-style, coding). Scheduled about 10 days after the recruiter call. Heard back 5 days later that I'd passed.
Week 4-5: Onsite (or "virtual onsite" in my case, done over Zoom across 2 consecutive days). Three rounds on day 1, two on day 2. Behavioral, system design, and a mix of coding rounds. Scheduling took about a week to set up.
Week 6: Waited. Heard back after 7 days. Passed.
Week 7: Offer call with recruiter. Verbal offer.
Week 8: Written offer letter arrived 3 days after the verbal.
So: about 7 weeks start to written offer. The process didn't ghost me at any point, which is honestly more than I can say for most places I applied.
One thing to note for people returning from a gap like me: they asked about the gap directly in the recruiter call and in one of the behavioral rounds. Not hostile, just matter-of-fact. I answered honestly and it was fine. I was worried about it more than they seemed to be.