Oily patch on my driveway in Khalifa City, can it be fixed fast?

Two days ago I saw a dark, oily patch on the ground under my Infiniti QX50, right on the driveway at my villa in Khalifa City. This morning it was bigger, and when I opened the bonnet, the engine looked wet near the front. The car has about a hundred and five thousand kilometres, and I need it every day for work and the school run, so I cannot leave it at a garage for long. My brother says a small leak is normal on an older car and I can wait. A friend says a leak only gets worse in the heat and I should fix it fast. I looked online for a Quick leak repair for Infiniti vehicles in Khalifa CityQuick leak repair for Infiniti vehicles in Khalifa City , but every page said fast and cheap, so I still do not know what is real. How can I tell what fluid it is by the colour and smell? Does the shop find the leak first, by cleaning the engine or using dye, before they start the repair? Can a leak be fixed in one day, or does it depend on the part? Is it safe to drive a few days if I check the oil level each morning? Is it normal to ask the mechanic to show me where the leak comes from? How much should a basic leak repair cost on an Infiniti? If your car had a leak like this, please tell me what it was, how long the repair took, and what you paid. Easy answers help me most.