Speedometer and driving time implausible, new Suzuki Ignis car

Hello, I am grateful for every advice. After already unpleasant experiences with the dealer I picked up my new Suzuki Ignis this week. Unfortunately I was excited and – since new cars – did not pay attention to the mileage and the indicated driving time. At home, however, I noticed when clicking through that the tacho stand is not quite plausible to the contract. It must have been computationally more kilometers than indicated, about 30km. However, I find the topic driving time more difficult. Is the on-board computer more than two hours over the time I was driving to. How can you explain this? Do I have to worry about using the car (before collection already fully paid) for test drives and the speedometer has been reset? Or are there other possible explanations? Thank you! Greetings Maya3