So far we have the following elements :

• Power-On Reset: a few parts (1 N-FET, 1M, 10µ, 1 diode)
• Oscillator : a few transistors, maybe a dozen of parts. Parts count and power draw are not significant because it's only one circuit.
• Divider: 15 stages of divide-by-two, 12 parts each : 180 parts (4P, 6N,2R=> 60 P-FET, 90 N-FET, 30×100K)
• AND2 for MUX decoding: 3× 4T=12 (6P-FET, 6N-FET)
• 2+5+3+5+3+5=23 stages of Johnson counters with reset: 13 parts×23=299 (23 diodes, 92P-FET, 138 N-FET, 46×100K)
• 46 partial AND2: 92 N-FET
• 6×digit enable (2N) = 12 N-FET
• 6×7 LED (41 actually)
• LED decoding matrix: 17 diodes, 7×10K
• Low-side LED drivers (7 N-FET, 7×1K)
• High-side digit enable (6 P-FET, 6×10K)
• 6 buttons to advance each digit + electronics

Total:

• about 360 × N-FET (2N7002)
• 164 × P-FET (BSS84)
• 1M Resistor
• 90×100K resistors
• 7× 1K resistors
• 41 diodes (1N4148 or better, I have Schottky aplenty)
• 41 LED

That's 700 parts !

OK that's a LOT but almost half http://www.transistorclock.com/ that contains 1257 parts.