Time expression stops working

The Evolution Options parameter in Fractal Noise has the option to Cycle evolutions over any number of cycles. There is no need at all to ever just run a time * a value expression on this property if you want it to go on for a very long time.

Your multiplier is very high. The expression time * 1500 means that the evolution will rotate 1500º in one second. That's one revolution just shy of every 8 frames in a 30 fps comp. 

If your evolution speed is critical then you need to do a little math. At 1500º per second, how many seconds does it take to rotate a multiple of 360º so you could get a perfect loop? 360 / 1500 = .24 seconds. Let's set the loop to 10 rotations. Now we have 3600 / 1500 = 2.4 seconds. At 30 fps 2.4 seconds is pretty close to 2:07 frames. If you set one keyframe at 0:00:00:00 at 0º and another keyframe at 0:00:02:07 at 3600º or 10 rotations, then added a simple loopOut() expression you would have. something extremely close to your time * 1500 speed and it would perfectly loop as long as you needed it to loop. If you wanted to speed up or slow down the evolution all you would have to do is drag the second keyframe to the right to slow it down or to the left to speed it up. There would never be a point where the calculations would run out of digits.

You can always split/ duplicate the layer and adjust the expression to compensate for the in point. Otherwise simply animating the parameter with keyframes an possibly using a loopOut("ping-pong") expression might also work. If it's realyl that long, nobody will noticve the repetitions and in addition you can of course also always animate the offset in addition to disguise this further by looking at a different area of the turbulence noise field.

Mylenium

As you said, you have reach the limit for this effect parameter. If you are looking a random movement with roughen edges, you can try yo use the random(X) expression, where X sets the range of possible values for your parameter. For example, you can use random(3500) and your evolution parameter will be any valueo between 0 and 3500.