There's a good visualisation of previous years completion times for the top 100 (which is a reasonable proxy to complexity) here by fixie skidder Prof jwo: https://github.com/jwoLondon/adventOfCode#completion-times
Yes it definitely gets harder. The time for the 100th completion of some of the days gets into multiple hours (the 100th person to finish part2 today [day 10] took ~36m for example).
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There's a good visualisation of previous years completion times for the top 100 (which is a reasonable proxy to complexity) here by fixie skidder Prof jwo: https://github.com/jwoLondon/adventOfCode#completion-times
Yes it definitely gets harder. The time for the 100th completion of some of the days gets into multiple hours (the 100th person to finish part2 today [day 10] took ~36m for example).