It depends on many many variables. where is the work, what country the company is based in, what your nationality is, what your experience is, etc.
The answer is unfortunately a figure in which both you and the company are happy to accept. That can between £10,000 and £60,000 a year or maybe some other figure. They may offer salary, they may offer dayrate.
It is also better just to ask a question once in one thread rather than in different threads at the same time.