Nearly one in three patients had to wait more than 12 hours in A&E after a doctor said they were sick enough to be admitted to a ward.
One in 10 had to wait between six and 12 hours before getting a bed, according to a new survey of 1,214 patients who were asked about different aspects of their hospital stay.
The survey was carried out by the Irish Society for Quality and Safety in Healthcare, a not-for-profit body.
Overall, the survey found good levels of satisfaction but many patients reported a lack of information about tests, the side effects of medication and the aftercare they got after leaving hospital.
* Eight in 10 patients expressed satisfaction with the quality and standard of food received during their hospital stay. But 18.6pc did not like what was served up for meals.
* Approximately eight out of 10 patients (81.4pc) expressed their satisfaction with the food during their stay.
* More than one in 10 on a waiting list had the procedure postponed more than once by the hospital.
* 96.5pc agreed that they were always treated with dignity and respect.
* Most patients were satisfied with the level of privacy during examinations.
* More than seven in 10 who received a new type of medication in hospital reported that all of the reasons for taking it were made clear to them.
* Of those patients who underwent a procedure, 52.9pc reported that the doctor marked the site for surgery beforehand. But more than three out of 10 said the site was not marked; 15.9pc could not remember.
* The majority reported that if they needed help it was given in a timely manner by hospital staff, while the remaining 9.3pc were dissatisfied with the time taken for staff to respond.
* Almost two-thirds said they did not receive any written information regarding the hospital and its routines.