Yes they did use trenches in German and Britain and France
It was about 9ft to 10ft.
Communication trenches (for runners).
There were electric light in German trenches in WW1 because they were more advanced and had better trenches than the British.
maybe
they were called long time stays because they were planning on ataying for a long time
Generally the German Army was better organized than the French Army; and were overall better able to maintain their field works.
they would be a massif hole in thwe ground it would be dirty massy and above all smelly
Reserve trenches
mainly because France's aim was to get the Germans to get off their land so their trenches didnt look like they had effort put into them coz they were constantly trying to move them forward but the German's were like naa lets just sit here be annoying and make our trenches nice till the french get tierd and then move a step forward.
To reduce the chance of being hit by a German shell
TheGermans realized that they would have to stay in hem longer so they carefully planned their trenches. The British however didn't realize this and hastily constructed their trenches. Hope that helped!