Sunnats and aadaab of wudhu

Q: Is it a bidah to make masah of the nape in wudhu?

Q: When we are taking wudhu, if before finishing the wudhu, we stop to talk to other people out of necessity or answering phone call for quite some time, do we have to re do the wudhu or can we just continue from where we have stopped? Please answer based on Shafii madhab.

Q: Is following the sequence is also a Fard in performing Wudu?

Q: When I make wudhu it takes too long at times as I feel I am not wetting or covering all parts of the limb I am washing. This is also causing the wastage of water. What can I do to ensure that I do not waste water and over wash? If I rub water over my arms or legs 3 times (and try to cover all areas of the arm or leg) but not every single hair gets wet will this count as still being wet and my wudhu accepted? I would say my arms and legs take the longest.

Q: When wiping eyes corners, I constantly doubt whether I have done it properly. I am sticking my fingers in my eye cases to ensure that I have wiped the corner and also the corner in the edge of the eyelid. Please advise me how to do, I already have lost lot of pairs of contact lenses because of this.