To　address　the　three　main　challenges　in　Digital　Twin　Network　(DTN),　we　propose　the　Elastic　Digital　Twin　Network　Modeling　(EDiTNetMdl)　fitting　in　network　life　cycle　to　restrain　resource　occupation.　The　challenges　our　solution　aims　to　tackle　are:　fulfilling　differentiated　requirements　across　Network　Life　Cycle　(NLC)　stages　with　a　single　DTN;　loosening　the　decision　delay　caused　by　current　DTNs,　hampering　utilization;　and　the　prohibitive　costs　of　fully　replicating　physical　telecom　infrastructure　and　systems.　To　tackle　these　challenges,　EDiTNetMdl　constructs　DTN　modeling　in　a　hierarchical,　multilayered　abstraction.　In　this　framework,　Telecom　Network　Elements　(NE)　are　represented　as　Classes　and　inheritance　hierarchies.　NE　functions　and　connections　are　transformed　into　class　methods　along　these　inheritance　chains.　NLC　stages　are　detected　through　probes　which　are　specialized　methods　used　to　deduce　the　stage　and　needs.　Complete　data　collection　occurs　at　the　bottom　NE　instances,　while　higher　stages　obtain　well-abstracted　metadata　and　functional　descriptions.　We　enumerate　7　NLC　use　cases　as　inputs　for　numerical　evaluations.　Both　the　number　of　DTN　Instances　built　and　methods　invoked　are　significantly　decreased　in　EDiTNetMdl　compared　to　contrasting　solutions.　Consequently,　the　resource　occupation　is　significantly　diminished,　further　highlighting　the　efficiency　gains　achieved　with　EDiTNetMdl.　©　2023　IEEE.