How long can these ATH'S last before we hit another bear market. Anyone still buying at these high costs? lol 
well my answer about the last question is "No I'm Not buying at this Moment" because i think that correction is near to come .I also believe that ATH is almost in the area so buying at this will cost you too much risk.
But about if how long will this Bull market will last ? How i wish that i know because for sure i will be ready to take off once the day comes near but the truth is ,
Even Elon Musk can't answer this exactly because the truth is not one can give precise answer.