During the time of some big ether token based ICO, ETH network get congested and the recent one we have was similar congestion. If they are aware of this situation than I think they will send your ETH after they solve their issue or when ETH network get healthy again.
Thanks
You already got the proper answer or information you do get regarding on this question better to lock out this thread to prevent repetition of post and answers regarding on this issue of delayed transaction on ETH. As been said above usually this problem occurs when theres congestion upon the network the same which we saw on bitcoin. Transfers would really much longer compared on ordinary days but eventually we should not really be worried too much.