Memory of stone

Puzzle
Boxes 7 and 8 give this information:
 * “This is the land of my beginning. Like the stone tablet, my memories were carved here. You who follow close after me and overtake me, when your business is settled, turn this to dust and scatter it in the wind. Six Sailors stand in the land of the beginning. Will they guide you to memories of the stone lying in a chasm of eternal rebirth? The bud’s head has just appeared…”
 * “The Dutch Sailor looks at today. The Venetian Sailor recalls three weeks ago. The Portuguese Sailor looks back at one week ago. The French Sailor runs their thoughts back to yesterday. The Spanish Sailor remembers 12 days ago. The English Sailor stares at two days from now. Thereafter, lies a place to return to and rest.”

Explanation
AAELGN is an anagram for ANGELA, the barmaid in London.
 * ‘Six Sailors stand in the land of the beginning’: Those are the 6 capital cities were you can start your journey in UWO.
 * ‘The bud’s head has just appeared’: This means that you have to use the capital letter (first letter) of the capital city in the riddle
 * The starting cities of each sailors (Dutch, Venetian, Portuguese, French, Spanish, English) -> (Amsterdam, Venice, Lisabon, Marseille, Seville, London) -> (A, V, L, M, S, L)
 * These letter correspond to these numbers (A, V, L, M, S, L) -> (1, 22, 12, 13, 19, 12) in the alphabet.
 * For example from Amsterdam zero days are subtracted or added to. The Venetian Sailor (Venice) three weeks are subtracted, which means three times seven days, is minus 21. Thus the change in numbers per letter is (0, -21, -7, -1, -12, +2)
 * The change is thus (1, 22, 12, 13, 19, 12) + (0, -21, -7, -1, -12, +2) = (1, 1, 5, 12, 17, 14)
 * This corresponds to (1, 1, 5, 12, 17, 14) – (A, A, E, L, G, N) in the alphabet.