you can just load blinky onto any xiao you have and adjust the timers in it to see how fast 50ms flash rate is. by default it flashes every 1000ms.
on the subject of current, I checked the datasheet,
Each led pulls 60ma total (20ma per color)
there are 60 leds in a 6x10 display.
60ma*60leds=3600ma
1 Amp == 1000ma,
Total current draw = 3.6A at max brightness.
TLDR: don’t program these to go full bright, it’ll brown out the mcu.