bear in mind that since thursday we've had a monster difficulty event:
+80% More Warm Lights, 96.08% Faster Suffusencing, +400% Trapdoor Minimum Monster Level,
+32.08% Increased Monster Difficulty, +50% Minimum Room Size Bonus Event in progress for 20 hours, 45 minutes
you can see what event is on here:
https://ladderslasher.d2jsp.org/This will be making things significantly harder. Also for a full solo whistle climb you're more looking at 4-12 hours total with decent gear.
I did 1-MQ since thursday, I finished on saturday and spent at least 6 hours on that climb and i was using 190ee armor and a 150ee level 55 dagger.
once you get yourself kitted out with a full 1-MQ set of items, groups are more likely to accept you which take usually just over 1 hour.