I can't answer that very clearly or easily.
At the time that I first squatted 1.5 and deadlifted 2x bodyweight, I had been training for 12weeks. Before that, I had been out of the gym for 3 months. Before that, I had done my first bout of Starting Strength, which had gotten me close to that level, but not all the way there, and not with an actual 1RM test at the end (the 3 months off was due to injury, so obviously I wasn't going to say "Hey, I'm seriously hurt, I should do some 1RM's now").
Before that, I had trained for about 4 years, but not powerlifting training or even barbell-specific training. Most of my lower body strength was from leg presses, half squats and what I would now identify as poorly executed RDLs.
I'm now approaching 2.5 and 3x bodyweight squat and deadlift, at the same weight I was at when I first did 1.5 and 2x bodyweight, although it's going to take longer to get there than 3 months (probably).