diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index 8038e0d..677dd13 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -217,12 +217,39 @@ double Calculator::GetCostFromDuration(Configuration* cfg,
     Q_UNUSED(payment_option);
     Q_UNUSED(nextDay);
 
-    if (cfg->YearPeriod.size() == 0
-        && cfg->SpecialDays.size() == 0
-        && cfg->SpecialDaysWorktime.size() == 0)
-    {
-        end_datetime = start_datetime.addSecs(durationMinutes*60);
-        return GetCostFromDuration(cfg, start_datetime, end_datetime);
+    static const PaymentMethod paymentMethodId = Utilities::getPaymentMethodId(cfg);
+    if (paymentMethodId == PaymentMethod::Steps) {
+        if (tariffIs24_7(cfg)) {
+            end_datetime = start_datetime.addSecs(durationMinutes*60);
+            return GetCostFromDuration(cfg, start_datetime, end_datetime);
+        } else {
+            if (Utilities::IsYearPeriodActive(cfg, start_datetime)) {
+                if (!prepaid) {
+                    BusinessHours businessHours = Utilities::getBusinessHours(cfg, paymentMethodId);
+                    if (businessHours == BusinessHours::OnlyWeekDays) {
+                        int const weekdayId = start_datetime.date().dayOfWeek();
+
+                        using WTIterator = std::multimap<int, ATBWeekDaysWorktime>::const_iterator;
+                        std::pair<WTIterator, WTIterator> p = cfg->WeekDaysWorktime.equal_range(weekdayId);
+
+                        for (WTIterator itr = p.first; itr != p.second; ++itr) {
+                            QTime const &from = Utilities::WeekDaysWorkTimeFrom(itr);
+                            QTime const &until = Utilities::WeekDaysWorkTimeUntil(itr);
+                            QTime const &startTime = start_datetime.time();
+
+                            if (from <= startTime && startTime <= until) {
+                                end_datetime = start_datetime.addSecs(durationMinutes*60);
+                                return GetCostFromDuration(cfg, start_datetime, end_datetime);
+                            }
+                        }
+                    }
+                }
+
+                qCritical() << __PRETTY_FUNCTION__ << "NOT YET IMPLEMENTED";
+                end_datetime = QDateTime();
+                return 0;
+            }
+        }
     }
 
     QDateTime start = start_datetime;