If you're looking for a mark to work towards 25-30k by yourself with no pots is certainly doable assuming good gear, a tight rotation, and you can apply Major Sorcery and Ele Drain yourself (or stam equiv). Even with pots getting 35k+ is very good. Top end is around 40-45k.
What's a good dps time for only yourself no outside buffs/debuffs and no pots. Just a food buff and skills
Dunno about 'no pots', I'd never participate in such a test. 33k (90 seconds) is what alot of hardmode trials guilds ask.
Edit:
Every guild is a little different in what they're looking for. Some guilds provide non to stamina and give buffs for magica. Some require stamina to get a higher score than magica. E.g. stam=90 sec magics=100 sec. Some give buffs to both, these will be more beginner friendly.
Honestly tho if you're doing more than 10-12k sustained self buffs you're fine for alot of the veteran trials.
I'm a stam DK. I do not have vma weapons or BiS gear atm. So I'm running an older trial build with tbs, nmg, agility. My latency sits at 350. Completely unbuffed including no self buffs or potions I can get 16k dps, sometimes up to 18k on the normal target skeleton.