What verbs are chosen in stanza 2 to indicate joint activity between the two lovers?

In my box are twelve black books
where I have written down
how we have sanded, oiled and planed,
planted a garden, built a wall,
seen jays and goldcrests, rare red kites,
found the wild heartsease, drilled a well,
harvested apples and words and days
and planted a golden tree.

Do all the verbs refer to the same kinds of activity?
Why do you think some of these verbs are repeated from stanza 1?
What does the combination of activities suggest about their relationship?
What sort of timescale do you think is implied?