Why just start and close challenge at once lost my xps?

Question

more times I have lost my xps at once stopping the challenge.

Answer 1

Yes it is to ensure fairness, else you could just google the answer for the challenge and that will mean no point in challenging

Answer 2

with a mobile phone it's too tedious though, to insert these bits of letters and digits at the right places of the challenge, and on time, after having worked through overly complicated code examples - at least in python. the time should somehow match the length of code and number of entries required per individual question :-/