Referring to cherry blossoms:
After they start to bloom, from one week ???? lots of flowers will bloom and (look) pretty.
I'm struggling to understand the part in bold. If I read it literally I get "When it makes around 10 days from/after a period of one week". Logically, therefore I get "Lots of flowers will bloom around 17 (10+7) days after they first start". Obviously I think my analysis is nonsense.
My guess is that it reads "Lots of flowers will bloom after a period of around 7 to 10 days from when they first start". Is this correct? Is there a way to break it down logically?
More generally what are the common ways to express an interval of time after which something will happen? I would have tried something like:
but that feels incomplete. It seems to be lacking the idea of later. I know I can says "2 days later" as 2日後に. I guess "around 2 days later" would be 2日後ぐらいに, but I expect 7日と10日後ぐらいのあいだに is completely wrong.