The sink tap takes 20+ minutes to even get lukewarm, never hot. I have lived with this for a while until I made an interesting discovery the other day. When the shower (in the same bathroom) was running hot water, the sink water was warm! A miracle or wonky piping?
The offending faucet has separate hot/cold handles. The shower has separate hot/cold handles. The source is a tanked water heater (gas). No other shower or sink in the house has issues warming up quickly.