You kept much better records than I
I planted "yellow" (how's that for a description
) purslane in April and it bloomed beautifully until about the 2nd week of Ocotober.
Portulaca, for the past 2 years, comes up from seed, blooms, and quits. Not sure why as before that, it would bloom much longer.
I love all the vibrant colors and doubles that portulaca offers but it doesn't last as long as purslane - for me....