I googled it and found a forum on Baidu about waiting forever for what looks like a video game to be released. The unhappy camper in the forum writes a lyric verse or two to express his frustration:
Translation (not accounting for poetic style):
You said you'd come to visit in two days
But I've been waiting more than a year
In this context, it means he's already been waiting for more than a year.
This also uses a sentence pattern
一（V）就（V）, which generally describes something which is done right after another thing, e.g. "我一到家就要睡了" (I'm going to bed as soon as I get home).
In this context, he is using that sentence pattern to stress how long he has waited.