Half an hour, two primal waters (40g EACH at my server), two greens (5g and 7g), vendor trash for 10g and a blue (40g).
When I first came there, there were 4 people. After two minutes there were one left, which went AFK. I farmed for 15-20 mins and the AFK guy started playing again. Still no problems as he killed very slow and took a 1 minute break after each one :=) Right before I left 2 other persons came. Still no problem.
At about 3+ people it might get hard getting spawns.