Default is how much? I believe its 0.0005 BTC/KB correct?
Yes.
A while ago i had changed it to 0. When i send bitcoin, i recalled few times it took very long for other party to receive. Thus after i sent bitcoin, it showed unconfirmed for a long time in my electrum wallet.
So if i change it to 0.0005 BTC/KB that should be fine? Also 0.0005 BTC/kb is equal to around how much btc? Is it 0.0005 BTC so around 22 cents? Or is it around 6 or 9 cents? In the old electrum client, i recalled the sending fee I had to pay was around 6 cents.
The 0.0005btc/kb should be fine, yes. How much btc that actually is and how much its worth in a different currency depends on how large (in bytes) the TX is and how much 1 BTC is worth currently. If we take 1 BTC = 450 USD and a TX size of 226b[1] you would pay
0.0005 / 1000 * 226 = 0.000113 btc fee
0.000113 * 450 = 0.05085 USD fee
Also if you create the sending transaction fee... would it make the transfer go faster? If so, how much to put in the btc/kb part in preferences?
There are several suggestions. Cointape (see [1]) currently suggests 30 satoshi per byte or
0.0003 btc/kb. Bitcoin core's current estimate for a 2 block waiting time is
0.00029968 btc/kbHow long on average does it take for the other party to receive the btc if you set the fee as
1. No Fee
I dont know, long.
2. Default Fee
I dont know, but I would guess that 50 satoshi per byte should put you in the next block most of the time, currently. Keep in mind that this can change if the network is filled with more transactions that pay a high fee.
3. Double the default fee. Or is that useless? Is there anything that put a bigger sending fee like 0.02 btc so it would go faster? Then again... the btc/kb on electrum doesn't exactly mean that btc right since its per kb?
You cant go faster than the next block. No matter how high your fee is, you will not make miners find a block faster.
Yes, its per kbyte to keep it consistant for small (in bytes) as well as large (in bytes) transactions.
[1] median according to
https://bitcoinfees.21.co/