My H was traveling internationally the first six weeks of our separation so it was not until two months in that he was able to be more consistent about contacting the kids. He has had to be prompted to actually spend time with them in person though.
Don't take my situation as a guide, though. Part of our difficulty has been about his involvement with the kids.
Me42, H40 D12, S8, S7 A revealed: 7/13 Sep 4/14; Agreed to D 1/15