I was still seeing new ones at least 10 days after I saw the first one. I'm not sure many of the ones I saw will actually produce. The first ones had practically dissolved by the time I left, last Sunday. There were some individual eggs (or dots) within the ribbons that really were bright, I assumed those were the most likely to hatch. I put out the wrong type branches though. Hopefully I'll get the same number of ribbons next year, but have them in a better position (on better branches) to get a better hatch.
12 yr old pond, 1 ac, 15' deep. RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs) I think that's about all I should put in my little pond. Otter attack in 2023.