Generally, reports made in sections which are only covered by global moderators will take a little longer, simply because there's less eyes on it, and global moderators are receiving a much larger number of reports than a dedicated moderator, therefore expect a little delay. They should eventually be handled, some may slip through, but generally I would say that most reports are at least reviewed once by staff.
I don't really care about reports that haven't been handled by moderators because I know they're not robots that can do 7x24 hour reports either. I only report spam posts from every spammer I come across for review
[whether to delete/not] and I can only wait to see if my report stats are good or not. Currently almost 50% of my reports are not handled by moderators, I have plenty of time to wait while increasing the number of spammers I report.
I am not sure about others, but for me when I found such users spamming continuously then I write in details on the report. Because it doesn't necessarily report all the posts one by one in case of pure spam. If it doesn't work then I send PM to the moderator directly with the reason why that user's post history should review. I can recall moderators were enough responsive to take action. So most likely you could do the same since you intend to help the forum by reporting spammers.
When I find a spammer then usually I will report at least 10 of their posts for review and I also don't forget to ask the moderators to review all of that user's post history to at least give them a warning via temporary ban if that user really can't stop spamming the forum. I don't intend to hurt other users on this forum, but someone who only cares about money by carrying signature and spreading spam endlessly should be warned through post deletion and temporary bans. Thanks for your thought.