Reminders on the iPhone are limited to daily reminders, with no real option to "snooze" an active alert. If you're interested in getting multiple reminders for a task on the list until it's marked complete, then the RemindMeAgain iOS tweak might fit the bill.
With RemindMeAgain installed, iOS will keep reminding you that a task is outstanding based on a pre-set interval of time. Until the task is marked complete, the tweak will make sure that the Reminders app continues to remind. Essentially, RemindMeAgain functions as a snooze button for the Reminders app.
Reminder intervals can be set to minutes and hours, and if desired the entire tweak can be disabled using Settings -> RemindMeAgain -> Active -> OFF. Sometimes the tasks listed in reminders can't be accomplished immediately. You have a snooze button for alarms to wake you up, why not implement a snooze button for reminders as well?
RemindMeAgain is available on Cydia from the BigBoss repo free of charge. Check here for instructions on how to jailbreak iOS 6.x with evasi0n. You can also find out how to purchase and install Cydia tweaks with this guide.