Hi,



It looks like Conrad osaka breakfast does not start until 0630 ( you have it down for 0630). Of course you could get something to eat the night before)
Not sure you will be able to check in at Conrad osaka that early ( or at least go to your room then). Check out can take longer than you think
Also I found the souvenir shop at HND airside to be relatively limited ( there are more shops on the shopping street above check in landside)
I also found that after a full day travelling/sightseeing , i did not want to go out for dinner and the lounge/hotel dining was adequate
I also found it was taking about an hour to enjoy breakfast at Conrads ( just enjoying the experience)- you could do it in less time but it is good to savour it rather than rush through it. Also the swimming pool in the Conrad osaka is good to enjoy
Also getting into& out of shopping centres and stations can take longer than you think ( esp tokyo station if you end up at the other end of the station from your desired stop

Regards

TBS