Far too long.

[a Borg scratches Data's flesh arm] Lieutenant Commander Data:
Ah! Borg Queen:
Is it becoming clear to you yet? Look at yourself, standing there, cradling the new flesh I've given you. If it means nothing to you, why protect it? Lieutenant Commander Data:
I... I am simply imitating the behavior of humans. Borg Queen:
You're becoming more human all the time, Data; now you're learning how to lie. Lieutenant Commander Data:
My programming was not designed to process these sensations. Borg Queen:
Then tear the skin from your limb as you would a defective circuit. [Data hesitates] Borg Queen:
Go ahead, Data! We won't stop you! [Data forces himself to try to tear off the skin] Borg Queen:
Do it! Don't be tempted by flesh! [Data relents and leaves the skin alone] Borg Queen:
Are you familiar with physical forms of pleasure? Lieutenant Commander Data:
If you are referring to sexuality, I am... fully functional, programmed in... multiple techniques. Borg Queen:
How long since you've used them? Lieutenant Commander Data:
Eight years, seven months, sixteen days, four minutes, twenty-two... Borg Queen:
Far too long. [they kiss passionately]