It takes me 45mins of driving 20 miles from my house to my office under normal circumstace,bt recently, I drive 1hr wit same mile due to d construction work going on on dat same route. I later discover another route different entirely bt I drive for exactly 1hr covering 23miles. So which is better?

Although the info you supplied is scanty, but there is an answer for you.

The 23 miles is better. Your fuel consumption will ironically be lower if you spend more time firing than when you are held-up. It is called 'city/highway fuel consumption ratio'. 2, Your long distance is most likely going to enhance your car's combustion which is good for your car. 3, Not drIving in the rough repairs of your road also reduces wear on your car and the possibility of okadas' scratch.

Hope that helps. And godspeed to those fixing your road. Cheers.

@BTT. Tanks for d info.