I generally look for posts:

• Top voted within 24 hours, usually the first 2 pages, sometimes more,
• Sometimes I browse posts with a specific community, mostly check the past 3 days, I generally reply to anything with 3 days and don’t care if its 1 minute ago or literally 72 hours ago.
• After that, I usually don’t comment, unless I’m really interested, and its within 14 days
• or if its a old post/comment saying stuff like “mark my words” and then something relevent happened recently in the news, and I might comment and be like “Lol you were right/wrong” regardless of how long ago. -If its a post I already viewed and mentally invested in the conversation, I’d re-visit new comments, I will reply there for up to 7 days since time of post. Or if its an ongoing debate in the comments, I can go on forever if it’s a good faith debate.