Distance an object has travelled over a certain time?

I cant think of a straight forward way of doing this.

First you will want to work out the distance since the last update. So something like:

 var distance: float=0;
 
 function Update()
 {
 distance += Vector3.Distance(object.position, previousPosition);
 previousPosition=object.Position;
 }

Now what not clear to me is whether you wanting the player to have moved a total amount of time since he started or he has moved a at least x amount distance in the last y seconds.

If its the former then the above gives you everything you want. If its the later then you going to need something more elaberate.

You will need to sample a distance in time and work out what the distance is for the last number of samples.

So maybe something like:

     var object: GameObject;
     
     var NumberOfSamples: int=10;
     var distances: float[];
     var lastSampleSlot: int=0;
     var previousPosition: Vector3;
     
     function Start()
     {
         distances=new float[NumberOfSamples];
     }
     
     function Update()
     {
         var currentSampleSlot: int = Time.time % NumberOfSamples;
         if( currentSampleSlot != lastSampleSlot)
         {
              distances[ currentSampleSlot] =0;
         }
         
         distances[ currentSampleSlot ] += Vector3.Distance(object.transform.position, previousPosition);
         previousPosition=object.transform.position;
         
         // sum all the values in the distances array to work out the distance in the last x samples secs.
         
         var TotalSampleDistance: float =0;
         for (var value: float in distances) 
         {        
             TotalSampleDistance += value;
         }
     }

For any given second, it works how far you have travelled in that second. It records that in the array. Everytime you move into a new slot, you clear out whatever was in there before.