Bitcoin ( BTC ) buyers should enjoy the chance to add to their stack below $40,000, says one of the crypto industry’s household names.

In a post on X (formerly Twitter) on Nov. 24, PlanB, creator of the stock-to-flow family of BTC price models, hinted that current levels would not be around long.

PlanB: Time is ticking on $40,000 resistance

Bitcoin is destined to go much higher than its recent 18-month highs, PlanB believes, and time is ticking to increase BTC exposure below $40,000.

Known for his optimistic takes on long-term BTC price growth, PlanB used realized price data to support the case for bulls.

Realized price is Bitcoin’s realized cap — the sum total price at which all BTC last moved — divided by the current supply. It is currently at just below $21,000.

Bitcoin bear market bottoms are characterized by the spot price dipping below the realized price, while bull markets begin once the spot crosses the two-year and five-month realized price levels. These refer to the realized price of coins that last moved within the last two years or the last five months — “younger” coins.

BTC/USD is now once again above all three realized price iterations.

“Enjoy sub-$40k bitcoin ... while it lasts,” PlanB commented on an accompanying chart.

‘Enjoy sub-$40K Bitcoin’ — PlanB stresses $100K average BTC price from 2024 image 0 Bitcoin realized price chart. Source: PlanB/X

Asked whether the market should expect lower levels from here, PlanB would not be drawn, saying that he simply expected an average BTC price of at least $100,000 between 2024 and 2028 — Bitcoin’s next halving cycle.

Bitcoin hodlers bet on six figures

While PlanB has fielded criticism over stock-to-flow — and conceded that Bitcoin was not able to live up to his expectations during its 2021 bull market — six-figure predictions for the next cycle are increasingly common.

Related: Bitcoin to $1M post-ETF approval? BTC price predictions diverge wildly

As Cointelegraph reported, these are coalescing around an area with $130,000 as its focus for the end of 2025.

The halving itself, meanwhile, due in April 2024, should produce a return to around $46,000 , further analysis says.

Earlier this month, PlanB described Bitcoin as being in a “pre-bull market” phase, with the real launch yet to come.