How often can a bitcoin block be mined?

Could you elaborate on the frequency of Bitcoin block mining? Given the complexity of the mining process and the variable difficulty levels, how frequently are new blocks added to the blockchain? I'm curious to understand the average time it takes to mine a bitcoin block, as well as any factors that may affect this timeline. Additionally, how does the mining difficulty adjust over time and how does it impact the rate of block mining? Understanding these dynamics is crucial for investors and miners alike.