I am often asked by responding parties who are new to the adjudication process whether it is really right that they should have to review so much documentation and respond to so many points in such a short period of time, typically 7 to 10 days to respond. Some people think that the process is hugely unfair.
The key point is that adjudication is only intended as a means of resolving pre-existing disputes, so the responding party is always likely to have to do some considerable work in explaining and evidencing its position, whereas the referring party has all the time in the world to do so before it presses the button. If it genuinely seems to be too much then it may well be that new arguments and positions are being advanced for the first time, which is something that adjudication is very much NOT supposed to cater for.
In such cases it best to prepare for the worst anyway and try to build a response but alert the adjudicator as early as possible and explain why the process is being abused, if the material is new then typically he should resign and the process will have to start again, but you'll have more time then!