[Can someone please check over my PCB Layout]

no problem for the circuit,  may make a prototype to test it.  

[How long it takes to finish PCB assembly project]

i make a PCB order at a China website www.allpcb.com/g6 and want to have them assembled for my project. 

but i was told it would take about 3 weeks, for pcb fabricating and assembly for only 50 units. 

i am wondering why it takes so long, is it normal?