TICK

The length of time that spells last is measured in ticks. Your character
also regenerates each tick, gaining hp, mana, movement, etc. Whether you
are standing, resting, sleeping, or fighting affects how much you
regenerate, among other factors. Some spell help files refer to their
duration lasting in hours -- this is the same as ticks. Its up to you
to learn from experience how long a tick lasts in real time.

Typing tick is also a command, explained below.

Syntax: tick [number]

TICK informs the players within the room that you are waiting for 1 tick.
You may also specify an amount of ticks to wait for, such as TICK 5. This
is usually used to announce to your companions that youre going to wait
and rest a bit.

See also:  REGENERATION