2lbs of chicken manure spread over a 4x50 bed isn't a whole lot so there shouldn't be much of a "burn" factor from excess nitrates/salts/etc. Also, that small amount spread over 4x50 should become safer a lot quicker than composting a pile as long as it's at/near the surface.

Wash your produce, it'll be fine. Be careful to wash any quick harvested green/leafy stuff well. Fruiting stuff should be much easier, and really not of much concern unless it's at/on ground level (like many squash types).

You might want to wear gloves and/or wash your hands immediately after gardening to lessen the chance of contaminating yourself with any possible germs even if it's a small chance.

Long story short, that amount of chicken manure over that much space isn't a huge deal to worry about...especially giving a month to sit around at/near the surface.

The time after applying manure to a garden refers to harvesting not planting. Produce grown above ground should not be harvested for 90 days after the manure is applied while produce growing in the ground should not be harvested for 120 days after because of potential disease pathogens.

ok. Great! Thanks for the info.