diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index afe43fa..12fa03a 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -159,7 +159,8 @@ std::string Calculator::GetDurationFromCost(Configuration* cfg,
             return CalcState::BELOW_MIN_PARKING_PRICE.toStdString();
         }
 
-        if (prepaid == false) {
+        int const pop_time_step_config = cfg->getPaymentOptions(paymentOptionIndex).pop_time_step_config;
+        if (pop_time_step_config == (int)ATBTimeStepConfig::TimeStepConfig::RECOMPUTE_SOME || prepaid == false) {
             int const pop_id = cfg->getPaymentOptions(paymentOptionIndex).pop_id;
             int const pop_accumulate_prices = cfg->getPaymentOptions(paymentOptionIndex).pop_accumulate_prices;
             int const pop_accumulate_durations = cfg->getPaymentOptions(paymentOptionIndex).pop_accumulate_durations;