I don't really know how I would even quantify this kind of expectation. Like... if you measure it by in-comic time, I don't really care if "1 week" or "a month" or "2 days" has gone by in the comic. What's happened in that time? A comic could take a a month to make it through a single conversation, and if the conversation was rapid fire with new revelations and reactions in every beat, it would feel fast-paced and exciting. By contrast, if you sort of montage your way past a few days of conversations and interactions over two pages, that's not going to feel fast-paced at all, even though you're technically covering a larger chunk of time.
How fast time moves in the comic is not necessarily how fast the comic is moving.
If you measure it by, how far into the story do I expect it to get, then that's gonna depend on how the story is divided up, and how complex it is. A simple story might expect to have at least reached its primary conflict after a year, while a more complex story with a lot of mystery or false leads will hopefully have a compelling motivation after a year, but still not fully know who's behind the real conflict yet.
I guess, as a reader, after a year I expect at least to have gotten to a point where I know what's going on and care about something. That doesn't mean I know the main conflict or whatever, but that I understand what the characters are doing right now, and have some clue as to why, and there's something that I genuinely care about them achieving.
Extremely! If a comic has already hooked me and I really care about the characters, I'm likely to stick it out through a slow patch and wait to see if it picks up in the next scene -- but if not, then after a month or two where nothing new is happening, I'm probably out.