LB status (returning player)

Hello everyone I am returning after almost 1 year break some of you may know me ign zeridor. I want to ask what is the status with LB? Firstly I don't have like 12 hours a day to run top 10lb but I am thinking about running for top 50 maybe top 25 in next event.
How much time you need to run top 50 and top 25?
How much gold will it approximately cost if I don't farm energy(top 50, top 25)?
Are there some changes to LB as new tie system or something else?

Thx for every info 👍.