There are a lot of variables to mining and earnings. Laptops tend to be on the low side due to the graphics being usually an integrated chip, even on gaming laptops they tend to just be a more evolved integrated graphics chip. Two other variables, cooling is hard on a laptop so if you do go the route of mining with it you might want to consider a laptop cooler fan to sit under it and another variable is in a non ASIC form of mining like with a cpu or gpu....you will want to go the route of mining an easier altcoin to trade up for BTC. BTC is highly difficult even on older ASICS at this stage so its pretty hard to mine on regular pc setups.

With all that in mind, you can still do okay mining. In your situation I would go more for NICEHASH to mine, it pulls in direct BTC payments for lending your hardware to them for mining altcoins and they pay the equivalent in BTC weekly back to your wallet. I have a few ASICS but I mine a lot of time on NICEHASH with my two GTX 1080 card but I average for a straight week of mining with them around $50-$60 bucks a week...so around 0.013 roughly in BTC. You would probably see a lot less with a laptop but hey its free extra money and if its just a laptop sitting around it can't hurt to set it up on NICEHASH and let her run for you.

Now a days though, it takes a lot of hardware and you got to factor in your costs of electricity for a true idea of the profits you will pull in. Mining can get complicated, I made a few mistakes a long time ago when I first got in and bought 2 dated Antminer ASICS, cost of electricity on them and potential profits is literally only a few bucks over so research in this area and a lot of math is wise before purchasing gpus and ASICs. Hope that helps, been thinking of new write ups on the mining side to things. Actually just got a riser so slapping a third GPU on my gaming pc, lol......its all about constantly adding new hardware to rack in the money with mining...seems to never end lol