your sh studios to create or edit bosses in monster.sdata to added a spawn range time for a boss the easiest way is to add the info in the ini files most of your better bosses like kimuraku ect. all run on a spawn time counter by mins its never exact but its usally pretty close this is the normal location of the file depending on the drive your using and the ep C:\ShaiyaServer\PSM_Client\Bin\Data the file name is Obelisk.ini youll see something like this in it
--Õ½ËÄ·çÊôÐÔBOSS °¬À*˹
[bothmob_026, (70, 1, 43200, (100,2000))] = (810.13,2.43,246.44),(2785)
--Õ½ËÄ·çÊôÐÔBOSS °¬À*˹ = a give name can be just about anything this is in Korean I thing
[bothmob_026 = a unique id kinda look at the botton of you ini file and find the last number there your next number if your last was this [bothmob_026 the next will be [bothmob_027
70 = the map code
1 = the number to spawn if im not mistaken been awhile sense I edited this ini file
43200 = time until next respawn in mins all times are listed in mins here
810.13,2.43,246.44 = the x,z,y coordinates where the monster will spawn at
2785 = the monsters id number
there are also better exsamples here and on youtube that go in to more detail then me and im a little rusty but im sure this will help you get on the right track
also a full server restart will be needed after editing these files in order for them to work correctly and don't forget the thanks button if this was helpful any