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Daytrading with Bitcoin a thing?

Why long term if I sell once I mean I have earned enough and if I wait to sell if it is not above what I spend on the coin? doing so I can't lose as long as I have no hurry to sell !
 
okay I see... so better look on 30 days or so ?
I don't think that is the right question to ask. Bitcoin is down 4% in the last 24 hours, so in your example trade, which would earn you 2k in 24 hours, if it hit 67k, you're actually down $5k.

I am not a trader, but there are no hard and fast rules, most of them will base time frames on bull-ish or bear market conditions. Obviously, with crypto being so volatile, you can operate on shorter time frames, but IMO anyone pushing day trading is either clueless, or is able to make money based on the frequency of your trading i.e an affiliate of an exchange.