More than that, the block times have increased for a while as the newly dominant GPU and CPU miners took over the network.
According to Binance, the blocks used to be more profitable to mine for a while.
“As a consequence, fewer miners were competing for blocks with pre-fork difficulty levels that assumed higher network aggregate hashrates, leading to longer block times,” according to Binance.
Binance says that with longer block times, all the adjustments that are implemented at future block height “mean that adjustment time is pushed back,” and the duration of the symptoms becomes even more extended.
Binance continues and reports that “It took roughly 36 hours for the average block-time to return to the normal average of two minutes per block. Unsurprisingly, the fork from April 2018 also led to a similar scenario.”
Binance further concludes that “household” miners will not make a profit in Monero.