microstrip electrical length
You are not giving us sufficient information in your question for us to answer you. If you are just running a 2.4 GHz signal from point A to point B, it does not matter what the line length is. The only things that would matter are:
1) if the line length were very long, say 4 inches, the signal will loose some of its power. This is because the microstrip line is lossy.
2) if you need to bend the line, how you do it can impact if it will work well or not
3) the width is important. If you know the type of material the board is made from (specifically its dielectric constant), and how thick that material is between your 50 ohm line and the ground plane, then you can calculate the correct width for 50 ohms.
4) if you are adding any components at all to the RF portion of the circuit, such as integrated circuits, capacitors, connectors, etc, you really need to know what you are doing, so get some advice