What happens if you send bitcoins without fees?

When you send bitcoins, the wallet automatically adds transfer fees, to pay the mathematical work needed to confirm the transaction.
Anyways, many wallets still allow to send a payment without fees: what happens if we do that?
Some “miners” will confim the transaction anyways, others instead ignore them: without fees or with very low fees, the time needed for confirmation is much higher, and it might never happen.So, I tried it, and I transfered 0.1 bitcoin on a “paper wallet“.
Those 0.1 bitcoin came from 24 smaller transactions (many small microtransactions that I made on FreeBitco.in), so the transaction was big: the suggested fee was 0.005 bitcoins, $0.50. Too much, I thought, considering how hard it was to earn them.
I ignored the warning and I transfered them nonetheless.
In the beginning I was serously worried: after two hours the coins were still in a limbo. I went to see transaction details on blockchain.info, and I saw that my queue position was constantly higher. I was on the 600th place, then on the 1800th, and so on. Quite obvious, because “miners” give more priority to who pays more fees.
But, after 461 minutes, the bitcoins arrived safely in my “paper wallet”

The conclusion is: without fees, bitcoins will still arrive, but with a big delay.

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