Generally, the at risk current for electrocution is thought to be >30mA. This is why RCD's (ELCB's) are designed to trip at that current. In medical facilities, operating rooms etc the RCD's normally trip at 10mA.
The at risk voltage is thought to be anything over about 70V because it has to be at least that high to establish a current of >30mA via human contact, meaning the resistance of the pathway for a 70V high risk shock would need to be in the 2000 to 3000 Ohms vicinity. In a sense, it is another way of saying that you require at least a minimum of 2 watts of continuous energy flow and at least 30mA for an electrocution event. Though the risk is altered by the timing of the voltage application compared to the cardiac cycle and whether it is AC or DC.
Generally, especially for small TV's VDU's the EHT supply, derived from the LOPT during the resonant phase of the operating cycle (flyback time) is designed to supply currents in the 10's to 100 of uA region, to support the CRT's beam current. Overload effectively shorts out the transformer (LOPT) and damps the resonance. In essence these supplies have a relatively high internal resistance. Though the ones in >26" color TVs were getting more risky in this respect and could reach a dangerous threshold. By this time in history though of the color TV, the EHT cap insulation and wiring was pretty good and hard to make accidental contact. Also as noted the energy storage in the CRT bulb is relatively low for small monochrome VDU's. This is why, over many decades of TV servicing, including many TV's in the early days that didn't even bother to insulate the EHT anode caps there were few if any electrocution events associated with contact with the EHT terminal. In fact I have never heard of one from the EHT power source in the last 50 years. If there was an electrocution from the TV set , those reported would have likely been from the line supply side or the B+ high voltage supplies.
This is one of the advantages of flyback supplies, in general, the intrinsic current limiting on overload. So much so you can buy things on ebay like Jacob's ladder kits etc with exposed wires, based on flyback supplies and the sellers are not too worried about electrocution events. Yet the terminal voltage appears "scary" being in the high kV region. Here is one using a TV LOPT and a electronic driver circuit, though they might be pushing the envelope, it looks like a color TV LOPT, it would be worth knowing what the short circuit current was or the current into a 2500 Ohm load:
1pc ZVS board. Jacob ladder are spare parts need to assemble by yourself. Claw electrode using insulator fixed to the floor, the floor will not be burned by hot wire. We will try our best to reduce the risk of the custom duties.
www.ebay.com
Here is another kit using a TV LOPT:
Jacob ladder are spare parts need to assemble by yourself. Claw electrode using insulator fixed to the floor . the floor will not be burned by hot wire. We will try our best to reduce the risk of the custom duties.
www.ebay.com
However, it is a completely different cup of tea with the other voltage sources inside a TV or VDU, early Tube TV's they were typically in the 400V region, the power supplies could source over 50 to 100mA in many cases, potentially lethal.
Even more modern color VDU's the B+ voltages can be over 100V B+ supplies and source high currents and are potentially lethal, to say nothing of the high voltage and the capacity storage on the line side of the SMPS, also potentially lethal, again because it is a high voltage supply, >70V with a very low internal resistance.
So it is a good question the OP had about how long to wait. Most sensible designs put bleeder resistors across the high voltage filter caps (these can sometimes go open circuit). Due to the electrolytic cap being intrinsically leaky though, most will be well discharged by the following day, even without bleeder resistors.