Drosophila embryos are a fraction of a square mm, and go from fertilization to hatching (as a larva) in about 22 hrs. So it’s possible to image individual embryos in their entirety with minute or sub-minute level temporal resolution (each 3D snapshot takes about 30-500 seconds, depending on method and resolution).
A couple of papers exploring whole embryo imaging appear in the latest Nature Methods. The accompanying N&V does a nice job of summarizing the different approaches. Check out some of the movies. They’re spectacular.