Its actually been many years since I've had a lapse of four days or longer.
I think the experiential reality for many people is that in the first few years, one's practice oscillates like a pendulum. Some people have breaks.
I think its natural that people oscillate in the beginning. Practicing Dhamma can be deeply confrontational and challenging. Intensity of practice seems to be accompanied by difficulties associated with dealing with one's sankharas and kilesas.
If you miss a session - just accept it and make an effort to rearrange things in your daily life so that meditation is maintained.
In the past, in order to accomodate the needs of a young family, I have scheduled my meditation after everyone has gone to bed and again before they got up in the morning.
The other thing that I advise is to maintain your precepts and try to practice right livelihood. These, when practiced, make the maintenance of meditation practice easier.
“No lists of things to be done. The day providential to itself. The hour. There is no later. This is later. All things of grace and beauty such that one holds them to one's heart have a common provenance in pain. Their birth in grief and ashes.”
- Cormac McCarthy, The Road
Learn this from the waters:
in mountain clefts and chasms,
loud gush the streamlets,
but great rivers flow silently.
- Sutta Nipata 3.725Compassionate Hands Foundation
(Buddhist aid in Myanmar) • Buddhist Global Relief