Yes it can! do it!
Yes it is possible…if u don’t have anythying else to do(like a job or something)…its simple maths
4 months * 30 days * 5hrs = waaaaay abbbooove 300 hours 
if u r nerdy type then u could even study 10 hrs a day…and prepare for L1 , L2 and L3 all at same time 
but if u r lazy like me(who needs 8 hr of sleep) and spend 12 hr at work…i think even 6 months would be less for L2 