How long does it take to learn Apex code?

I'm curious about the time frame involved in mastering Apex code. Could you provide an estimate of how long it typically takes for someone with a solid foundation in programming to become proficient in Apex? Are there any specific factors that can influence the learning curve, such as prior experience with similar languages or the complexity of the projects undertaken? Additionally, are there any recommended resources or strategies that can help expedite the learning process?