Saturday 16:47

Not too tough for a Saturday, and my time bears that out. And a theme, kinda. Locked letters are usually verboten without a good reason. This one is a little thin, but making all the black blocks singlets (the confetti shapes don't appear until you finish) makes sacrifices like this necessary, and they do all connect. Plus there are 6 grid-spanners across and down. There's some nonsense like 50-down, but not too much. Just a Z short of a pangram.