Often I simply dont have the time to complete the prison. There is work, family and so on and I loose everything I played for and get no reward for the 4 rounds I completed. This is realy disappointing and spoils the fun. I suggest that every character gets a checkpoint reflecting the round (1 to 5) you completed by actually playing it. This character can restart the next round of the prison at a later time. BUT !!! you can not join a checkpoint that you did not achieve by playing it. Hence you have to play the whole 5 stages to get your reward. ADDITIONALLY. you should be able to enter a lower round to play with and help your friends without loosing your highest achieved checkpoint, even if you have finished the prion at that level for the week. In such a way you can help and enjoy the prison again with your friends and it can be avoided that people just play stage 5. Also you can play in multiple sessions towards your reward, which is more in line with peoples real lives. At the moment there is no fun to continue playing destiny. Prison demands too lengthy sessions and Osiris is lag-switched to unplayability. It is really a shame how such a fun game can be destroyed.