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невесть сколькоstresses
gen. indefinitely (for an unlimited or unspecified period of time (Oxford Dictionary) ART Vancouver)
Gruzovik, inf. God knows how many; heaven knows how many; God knows how much
inf. nobody knows how many (MichaelBurov); nobody knows how much (MichaelBurov)
невесть сколько: 2 phrases in 1 subject
Informal2