Transparent method
User-entered work, waits and buffer placed on one calendar.
Work daysTotal entered loft hours ÷ entered weekly capacity × seven, rounded up.
Handoff daysEntered wait days are added explicitly and never erased by increasing loft capacity.
Latest startThe required date minus all calculated work, wait and buffer days.
Limits
The calculator treats stages as sequential and assumes the entered weekly capacity stays available. It does not know sail dimensions, cloth, construction, rig compatibility, quality requirements, freight reliability, weather, passage safety, staffing, contractual terms or live shop conditions. Model overlap by editing the entered durations, retain an independent buffer, and confirm any real commitment with the responsible loft.