As a cryptocurrency investor, I'm curious about the process of withdrawing funds from Zcash (ZEC). Could you explain in detail the steps involved in withdrawing my ZEC holdings? I'm particularly interested in understanding the security measures I should take to ensure my transaction is safe, the fees associated with withdrawing, and the estimated timeframe for the funds to reach my designated wallet. Additionally, I'd like to know if there are any limitations or restrictions on withdrawals from ZEC that I should be aware of. Your insight into this process would be greatly appreciated.