For filtering news signal results by time frame, you can:
1. When using Google News action, you can filter by date in Step 3 of the setup process, selecting a range from the past hour to the past year.
2. For existing results, use the filters button at the top of your table:
• Click "+ Add filter"
• Select the date column
• Choose a comparison operator (like "greater than")
• Enter your desired date
Regarding limited results: News & Fundraising Signals cost 6 credits per result, which might explain why you're only seeing 6 results if you have credit limitations.