I received BC from currency exchange provider. Is unconfirmed for a pretty long time. Is this standard waiting time or maybe sender did not provide enough fee? I didn't have any choice what fee he payed and I think it is not possible to pay it after the transaction... Thanks for the input.
The fees are quite low indeed. If you check the transaction instead of the address, you can notice that they are paying 51 Satoshi/Byte.
According to bitcoinfees.21.co, the recommended rate to get a transaction confirmed as soon as possible is around 220 Satoshi/byte nowadays.
So, what you can do is either wait until the transaction get confirmed, or spend the
UTXO by creating a new transaction with a high fee, following a Child-pays-for-Parent (CPFP) approach.