Anywhere within SFX that you enter time values you will use the same method. So if you are entering time values in a Wait command or the Fade Time in a Volume Change command or Entering Time Code Values, they are all entered in the same manner.
When you enter a time value SFX will always assume you are entering values in seconds if you simply type in a number and hit enter. So to enter a value of 5 seconds you type in 5 and hit Enter. If you enter a number and hit space and enter another number SFX will assume you are entering a value of minutes and seconds. So to enter a value of 5 minutes and 5 seconds you would type 5 5 and hit enter. If you enter a number, space, number, space, number, then SFX will assume hours, minutes and seconds. So typing 5 5 5, would enter a value of 5 hours, 5 minutes, and 5 seconds. To enter fractions of a second, simply put a period after the seconds and type in another number. So typing 5.5 and hitting enter would give you 5.5 seconds or 5 and ½ seconds. Or typing in 5 10.5 and hitting enter would give you 5 minutes and 10.5 seconds.
If you prefer to enter your time values of larger than one minute in just seconds that will also work. For example typing in a time value of 120 and hitting enter will give you a value of 2 minutes.
In addition to this method you can also use your mouse wheel to increase or decrease a time value. To use your scroll wheel to chance a time value, simply select the cell that contains a time value that you would like to change. If you scroll up with your mouse wheel, the time value will increase in one second increments. If you scroll down, the time value will decrease in one second increments. You can increase or decrease a time value in 3 second steps by holding down the shift key as you move your scroll wheel.
You may also increment or decrement time values by typing in the plus sign twice or the minus sign twice on your keyboard and then enter a value of time to add to or subtract from the current value. This works in a similar fashion as entering volume levels. If you type in ++10 and hit enter, SFX will increase the time value by 10 seconds. If you type in --20 and hit enter, SFX will decrease the time value by 20 seconds.
As with entering volume levels you can select multiple Cues with time values (such as Wait Commands or Volume Change Commands) and modify their time values as a group. Example, select multiple Wait Commands in your Cue List. (hold down Ctrl and Click to select multiple Cues in your Cue List) Click on the Remaining Column in one of the selected Cues. You can now type in ++10 and hit enter and that will make SFX increase all of the selected Cues' time values increase by 10 seconds. Similarly you can also select multiple Cues with time values and use your mouse wheel to scroll all the time values up or down together.