Few questions are dumb - we all have to learn. I would advise that you try and make your title a little more meaningful e.g. "Will a DVD record more than 4 hours in 4 hour mode". It helps us target replies more effectively.
Actually you will get around 4 hrs 5 mins on a DVD. With a DVD RW this is not an issue as disks do not need to be finalised. I am not sure if this is a problem with +/- R dsks (i.e. not RW).
I add a word of caution though about recording to a disk limit.
Depending on the quality of the actual DVD you may have difficulty in recording a full four hours anyway. A DVD is recorded in the opposite direction to a good old fashioned vinyl LP i.e from the middle to the edge.
In practice, most write failures tend to occur near the extreme outside edges. For this reason I try and avoid recording the last 200 MB or so. In practice, I would only record for about 3.5 hours.
In fact, if I record a 2 hour program, I tend to use 3 hour mode etc. but you will lose a bit of quality but even 3 hour mode is still better than a good VCR.
I also have a PVR and so if I have a recording which I want at top quality and it will fill a DVD, I make sure I record it on the PVR and the DVD at the same time.
Then if I get a disk failure I can re-copy it from the PVR at a later time.