By knowing your payout, you can calculate and anticipate your returns and the time required.
There are a lot of online calculators to help you determine your profits and ROI. One website to try is https://whattomine.com/coins/1-btc-sha-256
Your returns are affected by a lot of factors, the utmost important factors being:
1. Coin price
2. Mining difficulties
You can expect to ROI faster when the coin price increases. Understandably, ROI stretches longer when the coin price dips. Your returns can fluctuate daily depending on the coin price.
Given that the cryptocurrency market is having a bull run (as of May 2019), many users are enjoying the perks and waiting for the coin price to swell even more so that they can reap the returns faster. However, one should also be prepared for the worst when the coin price drops, especially below the acceptable range.
Mining difficulties, or network difficulties, refers to total hashrates on the network and it can influence mining income a lot. If there are a lot of miners deployed for mining, the difficulties start to grow and it will harder for miner to solve a block. Since the hashrates you own remains constant, your share in the total hashrates decreases when the difficulties increase, in turn cutting down your profit.
The outcome of your cryptocurrency mining, be it win or lose, is dependent on a lot of factors. None of these factors can be predicted or controlled, so we ask that you research and understand the risks involved before you lay your cash.