diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 9c908de..afe43fa 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -181,8 +181,8 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
                     price = pra_price;
                 }
 
-                //qCritical() << DBG_HEADER << "  PRICE" << price << "COST" << cost;
-                //qCritical() << DBG_HEADER << "  duration id" << durationId;
+                // qCritical() << DBG_HEADER << "  PRICE" << price << "COST" << cost;
+                // qCritical() << DBG_HEADER << "  duration id" << durationId;
 
                 auto search = cfg->Duration.find(durationId);
                 if (search != cfg->Duration.end()) {
@@ -207,11 +207,16 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
                             //found = true;
                             //qCritical() << "(" << __func__ << ":" << __LINE__ << ") duration_previous" << duration_previous;
                             //qCritical() << "(" << __func__ << ":" << __LINE__ << ") duration in minutes" << durationInMinutes;
-                            QDateTime d(inputDate.addSecs(duration_previous * 60));
+                            QDateTime d;
+                            if (pop_accumulate_durations) {
+                                d = inputDate.addSecs(durationInMinutes * 60);
+                            } else {
+                                d = inputDate.addSecs(duration_previous * 60);
+                            }
 
                             qCritical() << DBG_HEADER << "                    provided price (cost):" << cost;
                             qCritical() << DBG_HEADER << "        computed time for price (minutes):" << duration_previous;
-                            qCritical() << DBG_HEADER << "configured minimal parking time (minutes):" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;
+                            qCritical() << DBG_HEADER << "           minimal parking time (minutes):" << cfg->getPaymentOptions(paymentOptionIndex).pop_min_time;
 
                             if (duration_previous < cfg->getPaymentOptions(paymentOptionIndex).pop_min_time) {
                                 return CalcState::BELOW_MIN_PARKING_TIME.toStdString(); // minimal parking time is set by GetTimeSteps()