Title: On the complexity of temporal logics over linear time domains. We investigate the complexity of the satisfiability problem of temporal logics with a finite set of modalities. We show that the problem is in PSPACE over the following classes. 1.the class of countable linear orders. 2.the class of countable well-order. 3 the class of countable scattered linear orders. 4 the class of Dedekind complete countable linear orders. 5 the class of Dedekind complete countable scattered linear orders. 6 over the rationals. 7. over reals 8. and few more interesting classes with names which do not tell you much.