As no native speakers appear to have stepped up... there is a poll here with at least a summary in English (poll conducted June 18-19 this year by the "Rating" group.) According to that :
• 69% of respondents believe that Ukraine will join the EU in 5 years (40% believe it will happen in 1-2 years, and 29%, up to five years). Another 14% believe that Ukraine will become a member of the EU in the next 5 to 10 years, and 3%, in 10 to 20 years. Only 7% do not believe that Ukraine will integrate into the European Union.
So, yeah, the average Ukrainian seems much more optimistic on the time frame than e.g. the admission schedule for Croatia was, i.e. ~10 years since official candidacy.
One has to wonder if Macron's quip on the matter from May, speaking of "decades", made the news at all in Ukraine, but I don't know about that. Aside: I don't know if Macron would be flattered by this, but his approval rating in Ukraine is about the same as that of Turkish president Erdogan (58%/59% approve of them two- same poll), but certainly better than that of German Chancellor Scholz - 41% approval, it seems. (Polish President Duda had 90%., a score he shared with Boris Johnson.) The recent downward trend for Macron--he had 75% approval in April, seems to suggest that at least of the things he said may have been heard in Ukraine, but it we can't be too sure just based on that.
As for the original question, somewhat more detail (e.g. by age or region of Ukraine) is available in a slide (Ukrainian only).

To me, the most interesting part of that (left side) is that in the months prior (March), the expectation that Ukraine would be joining the EU fast (1-2 years) was even higher (up to 60%). This is quite in contrast to the same poll conducted in previous year, when virtually nobody said it would that little time. So, it does seem that the invasion had dramatically boosted those expectations, in terms of schedule as well, but since then we're seeing a downward trend.