Hello juanchu23 and Hans

 How I've solved and it works, look how long a particular effect. Copier this effect as many times as the time you want to lengthen and paste it under the first next line of the effect, kinda like the effects together, divide or repeat at a different place does not work. VB1 

What probably can put an effect on different places is just the effect on the other place to a new name, but you should not forget to make a copy in the same void and the name. Might work, not tested. VB. 2

Example:

VB1

theaterChase(0xff,0,0,50);

theaterChase(0xff,0,0,50); 

theaterChase(0xff,0,0,50);

FadeInOut(0xff, 0x00, 0x00); // red

FadeInOut(0xff, 0xff, 0xff); // white

FadeInOut(0x00, 0x00, 0xff); // blue

Slower:

Strobe(0xff, 0x77, 0x00, 10, 100, 1000);

Strobe(0xff, 0x77, 0x00, 10, 100, 1000);

Fast:

Strobe(0xff, 0xff, 0xff, 10, 50, 1000);

VB2

theaterChase(0xff,0,0,50);

colorWipe(0x00,0x00,0x00, 50); 

etc.

theChase(0xff,0,0,50); (copy van theaterChase(0xff,0,0,50);)

Now to the void portion:

void theChase(byte red, byte green, byte blue, int SpeedDelay) { ….

(copy van theaterChase)

Awesome - good to hear that Pierre! 

Timing is probably not the most accurate, but for most purposes probably sufficient.
When using timers, one would let an effect loop until the timer reaches it's goal time, which would then abort an effect and go to the next one.
I haven't had time these past weeks to play with it, but maybe it's something for my next LED project 

"I have a question: how can make a effect running in a delimited time (ej. 10 seconds)?"

void loop() {
// Other things that should run periodically inside loop() go here
EVERY_N_MILLISECONDS(time) { // Or EVERY_N_SECONDS(time)
function(); // Call to an effect function
}
} // loop()

Thanks 1234abcd ... nice catch!

The breaking up of the code probably is caused by entering the code after pressing the "Source code" button. As a workaround I usually enter the code first, select it, and then click the "Source Code" button. It may depend on the OS if SHIFT+Enter works (on my Mac it does).

Hm, I did just that. Pasted code directly from the Arduino IDE underneath what I wrote, then used your button (Crome and Safari). Then I when I put the cursor in the now block-formatted code and want to create an empty line, I get separate code blocks, not an empty line inside the code.

Yeah, one of these days I'll need to go find me a bett6er Forum (and editor) ... 

I usually paste the code, select the code and then press the button. When I need to add lines Shift+Enter ... I use Google Chrome by the way under macOS.

Just to add for completeness; according to Mark Kriegsman, who does the FastLED code, one can use MILLIS, SECONDS, MINUTES, HOURS and DAYS to time animations with the EVERY_N_# approach. One can apparently also use multiple timers of that sort in an Arduino sketch to time various animations concurrently.

Here is a condensed version of Stefan Petrick's suggestion of how two animations run independently on a single strip; short red stripes in one direction, longer green stripes in the other direction. The idea is - why not simply use more than just one CRGB object? Two EVERY_N_# timers would add independent speeds also. Think a slow sunset to night city glow animation where occasionally white stars are twinkling on top...

#include <FastLED.h>
const byte pinData = 3;
const byte pinClock = 4;
const byte ledCount = 144;
CRGB leds[ledCount];
CRGB leds2[ledCount];
CRGB leds3[ledCount];
void setup() {
  FastLED.addLeds<APA102, 3, 4, BGR>(leds, ledCount);
}
void loop() {
  animationA();
  animationB();
  for (int i = 0; i < ledCount; i++) {
    leds = blend( leds2, leds3, 127 ); // Mix both animations
  }
  FastLED.show();
}
void animationA() { // Red stripes forwards
  for (uint16_t i = 0; i < ledCount; i++) {
    uint8_t red = (millis() / 3) + (i * 5);
    if (red > 64) red = 0;
    leds2 = CRGB(red, 0, 0);
  }
}
void animationB() { // Green stripes backwards
  for (uint16_t i = 0; i < ledCount; i++) {
    uint8_t green = (millis() / 3) + (i * 5);
    if (green > 128) green = 0;
    leds3[ledCount - i] = CRGB(0, green, 0);
  }
}