You get muted when you send too many messages in small period of time.
There is a formula that tells you for how long you will be muted:
Where: OLDTIME = Duration of your previous muting, in seconds
Where: X = How many times you got muted previously, an integer
- Example1: If it's your 1st mute, then OLDTIME = 0 and X = 0, therefore the equation becomes: 0+10*0+5 = 5 Seconds
- Example2: If it's your 2nd mute, then OLDTIME = 5 and X = 1, therefore the equation becomes: 5+10*1+5 = 20 Seconds
Keep increasing X and you will get the following table:
Source: https://tibia.fandom.com/wiki/Mute