If the time is divisible by 55 without rest (so time = {0, 55, 110, 165, ...}), show the current time/55 value at (50|50) in the world (and remove any other showText which was previously at this position).
55 is about the number of act cycles per second when the slider is in the middle.
The '%' is the remainder operator. It returns the remainder of the two dividends instead of returning a double (decimal number). So 100 / 55 = 1818181818... (1 + 9/11), but 100 % 55 = 45. So if you do == 0 afterwards that means that there is no remainder meaning that the number is a multiple of 55. The code above will show a 1 when time == 55 and a 2 when time == 110 and so on.