Quote from: M.Antonio on Today at 08:38:13 AM

how long does it take to download all the blocks for full node?

and how safe is qt wallet full node compared to the ledger?

Assuming that you have a fiber connection or medium-speed internet, you need an average of 2 to 5 days to complete the synchronization. The faster the internet and the better the specifications of your device, the shorter the period.
But why do you need to run a full node?

Hardware wallets provide you higher security, while full nodes such as bitcoin cores give you greater privacy, so it is better to buy a hardware wallet instead of running a bitcoin core ( if you are planning for security, not privacy.) ledger are a bad choice for hardware wallets and you should avoid them.

Quote from: hosseinimr93 on Today at 08:59:08 AM

The current blockchain size is around 550 MB and the time it takes to download that depend on your internet speed

GB*