Allow 4 to 8 weeks for screening and 3 to 6 months for a full ISO 14040/14044 LCA; a complex or multi-product LCA can take 6 to 10 months. Data collection is the longest phase: 2 to 3 months for a first LCA, longer if the supplier chain is complex. Scoping takes 2 to 4 days of work with your technical team, and impact calculation 2 to 4 weeks. Starting collection early with the 5 most critical suppliers is the best way to meet the timetable.
Read the source article: First product LCA: steps, cost and mistakes to avoid