It takes too long than expected after interview, like i have to wait around 15 -20 days after interview but still did not get any clear answer from them, then have to ask again and again then got answer if rejected or failed

Got a call from company HR and interview got schedule on onsite. went for interview in the office and HR asked me to wait for 10 min as interview is on another call. After 15 min went inside the meeting room and had discussion unprofessionally with interviewer and he was done in 10 min.