I think that the trip from Bucharest to Istanbul in May should count as one interrail day as there is a through sleeper from Dimitrovgrad to Halkali.
My problem is that the Interrail app is coming up as two separate journeys on two separate days:
Dimitrovdrad - Kapikule 22.50-00.45 on Saturday
Kapikule - Halkali 2.30-6.34 on Sunday
How do I avoid using two days of my 5 day pass?
Thanks