When we talk about manure, we mean animal excrement plus bedding. The amount of nourishment manure supplies to a plant the first season depends on the ratio of bedding to excrement. More bedding means less nourishment to plants the first season, but a greater residual effect for subsequent seasons. Hot manures'' are so-called because they readily heat up when stacked in a pile. The heat comes from the burst of microbial activity stimulated by these manures' relatively high concentrations of nitrogen and low concentrations of water.
Most gardeners dig it into the soil immediately.
If the manure is well-rotted, with the bedding material no longer recognizable, planting can begin when the soil is smoothed. If the manure is relatively raw, wait at least two weeks before planting. You could also just lay manure on top of the ground as mulch. This is fine if the manure is rotted, but nitrogen escapes as gas from fresh manure exposed to sun and wind. The nitrogen loss is wasteful, but it may be worth the sacrifice considering the benefits of the mulch.