you can do 2 thing.
use an npc to teleport you in the map, and simple use the TIMERECALL function
or. use a mapquest, starts effect as soon as someone walks on to a map.
add this on the end of your map in mapinfo.
CHECKQUEST(timerecall)
then goto mapquest_def folder, and make a txt file called timerecall.txt
in that txt file, add this
[@main]
#IF
#ACT
TIMERECALL 3
#SAY
You time three minutes.
that will recall you just outside the map after 3 minutes. if you want to make it more complicated, and make it so you can only walk in to the map once, then i will explain that later.