int start;
int x1 = 250;
int x2 = 250;
void setup() {
start = millis();
size(700,700);
}

void draw() { 
int timer = millis()-start;
if (timer > 50)
{
start = millis();
text(timer, 20, 20);
x1 = x1 + 10;
x2 = x2 - 10;
}
for (int y = 50; y < 700; y = y + 50)
{
ellipse(x1,y,50,50);
ellipse(x2,y,50,50);
}

}