C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization VI\DLC\Expansion1\Data
Expansion1_Eras
is the file you want to edit
Above is where a file that you can adjust resides, if you x3 the range you may get closer to what you want, use whatever numbers suit you as i suspect your mixing matching tech civic great people and calender changes from mods, making getting the scale right will be tricky.
<Eras_XP1>
<Row EraType="ERA_ANCIENT" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_CLASSICAL" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_MEDIEVAL" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_RENAISSANCE" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_INDUSTRIAL" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_MODERN" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
<Row EraType="ERA_ATOMIC" GameEraMinimumTurns="120" GameEraMaximumTurns="180"/>
otoh 8AgesOfPacemod has a master tabe in which you can input any numbers you want that will effect tech civic great people at the same rate, also you can adjust the callender to be in line with your changes, so look at the values in the X5 x10 speed mod your using, apply them to 8 Ages mod master table ie 10 X callender mod gives you the numbers of turns in game, so take those numbers and put them into the cal;lender for 8 Ages, likewise the X5 speed tech numbers of whatever value your using.