Over the last 2 years I’ve had a few friends Join.
NR/DEC - 7/8 month for 737
FO’s both TR & NTR 4-6 months,
Only person I know who joined any quicker was an 757 rated FO who worked is 3 month period and joined them a week later, this was 18-24 months ago, maybe slightly longer.
Good Luck