Timber-Concrete-Composites (TCC) are a perfect symbiosis of two entirely different buildingmaterials, as the most favorable properties of both components are utilized. This ensures an efficient use of thenatural resources. As regards the long-term creep behavior however, only a rough estimation can be done basedon the current versions of the design standards (EN 1992-1-1 and EN 1995-1-1). The focus of this work is oncombining existing models for the individual time-dependent behavior of concrete and timber with commonstructural analysis methods to investigate composite structures, similar to Binder et al. (Buildings, 2022). Thehybrid model is applied to a simply supported TCC slab consisting of a cross-laminated timber (CLT) plateand a connected concrete layer on top. For comparison, two other floor constructions, namely a CLT slab andan in-situ concrete slab, are investigated as well, considering the same time-dependent material behavior. Allthree slab types fulfill the design requirements for long-term deformations and for stress limitation to avoidnon-linear creep. The time-dependent deflections of the slab types over 50 years are modelled and comparedwith the design according to the standards. This comparison shows that the hybrid approach for TCC and CLTfloor constructions yields smaller deflections than the calculation according to the design. standards. Modellingresults of the in-situ concrete slab were quite similar to the results of the design according to EN 1992-1-1.Comparing the modelled deflections of the TCC slab with the other two shows that the deflection of thecomposite slab changes the most over 50 years. At the beginning the behavior of the TCC is closer to theconcrete slab but develops more towards the CLT slab at the end of the investigated 50-years period. Herein,also the load redistribution within the cross-sections is shown based on the hybrid model and the axial stressesof the individual parts of the cross-sections.