Carnet renewal and temp leaving country without bike
Had been planning a long trip with no real time limits. Am based in the UK but am planning to go to Eastern Europe (Czech R or Hungary) to do some teaching English for a couple of years. Prior, during and/or post this I would take my bike on through the Middle East (Syria, Lebanon, Iran etc) and then perhaps on to India, N.Africa or back to Europe.
How long do carnets last for and what is the procedure/cost for renewals and their time scale?
Can I base myself in a country but then leave the bike there to do travelling in countries without it (for example a flight out to friends in Taiwan)?