So, again two or more guys are tied on time in a Grand Tour (hundreths of a second notwithstanding), like Hindley and Geoghegan Hart before the final Giro stage.
But it really is not something which happens that often.
It's a bit of a drag to check but it seems like it has only happened once before in the Vuelta in the past five years apart from some inevitabilities owing to opening day team time trials. That was in 2016 where 10 riders were still tied after stage 2 (the opening day was a TTT where Sky and Movistar were same time).
In the Tour, GVA and Tejay were equal a few days in 2017 after a TTT before Greg began taking bonus seconds. Otherwise, we have to go back to 2014 where Kittel won the opening stage when the bonus seconds were abandoned (they were out from 2008 to 2014) as he had done in 2013, where we also had the Gerrans-Impey switch-around days.
The last time it happened in the Giro was in 2016 where Dumoulin and an unknown Roglic were same time on the opening day ITT, so they had two days on same time there. The year before, there was one day where four ORICA riders were equal after the opening TTT and then stage 2 before Matthews got bonus seconds to put him ahead.
But all these instances were due to TTT's or opening bunch sprints in races without bonus seconds, with one exception (Roglic vs Dumoulin which was an opening day ITT). This just shows that it happening twice in a week in two different Grand Tours without TTTs, 10 or more days in, is a statistically quite extremy oddity.