I think everyone gets slightly different tasks to complete, but for me, the stumbling block has always been the "Be dealt ‘a certain hand’ multiple times, for example King 9. Can be there all day and not hit it, especially more than once. The rewards haven’t really gone up but the tasks just get more and more time consuming and really unfathomable.
What I find helps to complete them quicker is to play heads-up or against the fewest possible players. Heads up means you get dealt hands a lot faster and the turnaround is much faster, rather than having to wait for 5+ players to do their thing, plus the odds of you landing a good hand or the hand you need are increased if there are only 2 of you at the table.