How Can I Use Time in a For Loop?

I know it sounds like a dumb question, but it's been bothering me for some time now.

I know how to use a for loop, but I don't know how to use it with Unity's time scale. My problem is this:

I need to do a block of code for randMovementTime which is a float variable created and assigned a Random.Range value in the Awake function. So the for loop would look like this:

Code (JavaScript):

1. for (i = 0; i > randMovementTime; statement3)
2. {
3.   // Block of code goes here...
4. }

I don't know how to increment i in statement 3 at the rate of Unity's time scale to make it equal randMovementTime.

To put it simply: I want to know how to do a for loop for a certain amount of time.

i would have to be time, but any version of time would be the time since level load or time since startup, but I need the time since the for loop was last triggered, so i needs to start at 0 and be incremented at the rate of the time since the for loop was last triggered.

Any help is greatly appreciated!

EDIT: I am using this for loop in the Update function, so no coroutines.

- Chris

 

I have tried to workaround this problem, but by doing so I have come across a smaller problem.

My workaround was to call a function from within the update function. My code went as follows:

Code (JavaScript):

1. function Update ()
2. {
3.   if (canMove == true && playerIsDead == false)
4.   {
5.     Movement ();
6.   }
7. }
8.  
9. function Movement ()
10. {
11.   while (moveDown == true)
12.   {
13.     transform.Translate (0, -Time.fixedDeltaTime * randSpeed, 0);
14.  
15.     yield WaitForSeconds (randMovementTime);
16.     moveDown = false;
17.     moveUp = true;
18.  
19.     break;
20.   }
21.  
22.   while (moveUp == true)
23.   {
24.     transform.Translate (0, Time.fixedDeltaTime * randSpeed, 0);
25.  
26.     yield WaitForSeconds (randMovementTime);
27.     moveUp = false;
28.     moveDown = true;
29.  
30.     break;
31.   }
32. }

The problem I had with the above code was that at normal speed, the object would move up more than it would move down. But it works fine when I do it frame-by-frame.