They appeared in different times, several weeks, depending on the type of crop, its condition, humidity of plants, soil, and intensity, energy of the lightning discharge.
Sila ay lumitaw sa iba't ibang oras, ilang linggo, depende sa uri ng crop, ang kalagayan nito, ang halumigmig ng halaman, lupa, at iting, lakas ng kidlat ang naglalabas.